Korean War

The Korean War (1950–1953) was a military conflict between the Republic of Korea, supported by the United Nations, and the Democratic People's Republic of Korea and People's Republic of China (PRC), with air support from the Soviet Union. The war began on 25 June 1950 and an armistice was signed on 27 July 1953. The war was a result of the political division of Korea by agreement of the victorious Allies at the conclusion of the Pacific War. The Korean peninsula had been ruled by Japan from 1910 until the end of World War II. In 1945, following the surrender of Japan, American administrators divided the peninsula along the 38th Parallel, with United States troops occupying the southern part and Soviet troops occupying the northern part.

The failure to hold free elections throughout the Korean Peninsula in 1948 deepened the division between the two sides, and the North established a Communist government. The 38th Parallel increasingly became a political border between the two Koreas. Although reunification negotiations continued in the months preceding the war, tension intensified. Cross-border skirmishes and raids at the 38th Parallel persisted. The situation escalated into open warfare when North Korean forces invaded South Korea on 25 June 1950. It was the first significant armed conflict of the Cold War.

The United Nations, particularly the United States, came to the aid of the South Koreans in repelling the invasion. After early defeats by the North Korean military, when a rapid UN counter-offensive repelled the North Koreans past the 38th Parallel and almost to the Yalu River, the People's Republic of China (PRC) came to the aid of Communist North. A Chinese counter-offensive repelled the United Nations forces past the 38th Parallel. The Soviet Union materially aided North Korea and China. The threat of a nuclear war eventually ceased with an armistice that restored the border between the Koreas near the 38th Parallel and created the Korean Demilitarized Zone (DMZ), a 2.5-mile (4.0 km) wide buffer zone between the two Koreas.

During the war, both North and South Korea were sponsored by external powers, thus facilitating the war's metamorphosis from a civil war to a proxy war between powers involved in the larger Cold War. From a military science perspective, the Korean War combined strategies and tactics of World War I and World War II—swift infantry attacks followed by air bombing raids. The initial mobile campaign transitioned to trench warfare, lasting from July 1951 until the 1953 border stalemate and armistice.

Background

Etymology

In the United States, the war was officially described as a police action owing to the lack of a declaration of war by the US Congress. Colloquially, it has been referred to in the United States as The Forgotten War and The Unknown War. The war ended in stalemate, but the issues concerned were much less clear than in previous and subsequent conflicts, such as the Second World War and the Vietnam War. Moreover, in American historical consciousness, the war has to a significant degree been "historically overshadowed by World War II and Vietnam," leading to the term "forgotten".

In South Korea the war is usually referred to as the 6–2–5 War (yuk-i-o jeonjaeng), reflecting the date of its commencement on 25 June. In North Korea the war is officially referred to as the Fatherland Liberation War (Choguk haebang chǒnjaeng). Alternately, it is called the Chosǒn chǒnjaeng ("Chosǒn war", Chosǒn being what North Koreans call Korea). In the People's Republic of China the war is called the War to Resist U.S. Aggression and Aid Korea (traditional Chinese: 抗美援朝戰爭; simplified Chinese: 抗美援朝战争; pinyin: Kàngměiyuáncháo zhànzhēng.) The "Korean War" (traditional Chinese: 朝鮮戰爭; simplified Chinese: 朝鲜战争; pinyin: Cháoxiǎn zhànzhēng), with the word "Chao Xian", a general term for Korea, and officially North Korea, more commonly used today.

Japanese rule (1910–1945)

Main article: Korea under Japanese rule

Upon defeating the Qing Dynasty in the First Sino-Japanese War (1894–96), the Empire of Japan occupied the Korean Empire (1897–1910) of Emperor Gojong—a peninsula strategic to its sphere of influence. A decade later, on defeating Imperial Russia in the Russo-Japanese War (1904–05), Japan made Korea its protectorate with the Eulsa Treaty in 1905, then annexed it with the Japan–Korea Annexation Treaty in 1910.

Korean nationalists and the intelligentsia fled the country, and some founded the Provisional Korean Government in 1919, which was headed by Syngman Rhee in Shanghai. This government-in-exile was recognized by few countries. From 1919 to 1925 and beyond, Korean communists led and were the primary agents of internal and external warfare against the Japanese.

Korea under Japanese rule was considered to be part of the Empire of Japan as an industrialized colony along with Taiwan, and both were part of the Greater East Asia Co-Prosperity Sphere. In 1937, the colonial Governor–General, General Jirō Minami, commanded the attempted cultural assimilation of Korea's 23.5 million people by banning the use and study of Korean language, literature, and culture, to be replaced with that of mandatory use and study of their Japanese counterparts. Starting in 1939, the populace was required to use Japanese names under the Sōshi-kaimei policy. In 1938, the Colonial Government established labor conscription.

In China, the National Revolutionary Army and the Communist People's Liberation Army helped organize refugee Korean patriots and independence fighters against the Japanese military, which had also occupied parts of China. The Nationalist-backed Koreans, led by Yi Pom-Sok, fought in the Burma Campaign (December 1941 – August 1945). The Communists, led by Kim Il-sung, fought the Japanese in Korea and Manchuria.

During World War II, the Japanese utilized Korea's food, livestock, and metals for their war effort. Japanese forces in Korea increased from 46,000 soldiers in 1941 to 300,000 in 1945. Japanese Korea conscripted 2.6 million forced laborers controlled with a collaborationist Korean police force; some 723,000 people were sent to work in the overseas empire and in metropolitan Japan. By 1942, Korean men were being conscripted into the Imperial Japanese Army. By January 1945, Koreans comprised 32% of Japan's labor force. In August 1945, when the United States dropped atomic bombs on Hiroshima and Nagasaki, around 25% of those killed were Koreans. At the end of the war, other world powers did not recognize Japanese rule in Korea and Taiwan.

Meanwhile, at the Cairo Conference (November 1943), Nationalist China, the United Kingdom, and the United States decided "in due course Korea shall become free and independent". Later, the Yalta Conference (February 1945) granted to the Soviet Union European "buffer zones"—satellite states accountable to Moscow- as well as an expected Soviet pre-eminence in China and Manchuria, in return for joining the Allied Pacific War effort against Japan.

Soviet invasion of Manchuria (1945)

Main article: Soviet invasion of Manchuria (1945)

Toward the end of World War II, as per a US-Soviet agreement, the USSR declared war against Japan on 9 August 1945. By 10 August, the Red Army occupied the northern part of the peninsula as agreed, and on 26 August halted at the 38th parallel for three weeks to await the arrival of US forces in the south.

On 10 August 1945, with the 15 August Japanese surrender near, the Americans doubted whether the Soviets would honor their part of the Joint Commission, the US-sponsored Korean occupation agreement. A month earlier, Colonel Dean Rusk and Colonel Charles H. Bonesteel III divided the Korean peninsula at the 38th parallel after hurriedly deciding (in thirty minutes) that the US Korean Zone of Occupation had to have a minimum of two ports.

Explaining why the occupation zone demarcation was positioned at the 38th parallel, Rusk observed, "even though it was further north than could be realistically reached by US forces, in the event of Soviet disagreement ... we felt it important to include the capital of Korea in the area of responsibility of American troops", especially when "faced with the scarcity of US forces immediately available, and time and space factors, which would make it difficult to reach very far north, before Soviet troops could enter the area." The Soviets agreed to the US occupation zone demarcation to improve their negotiating position regarding the occupation zones in Eastern Europe, and because each would accept Japanese surrender where they stood.

Chinese Civil War (1945–1949)

Main article: Chinese Civil War

After the end of Second Sino-Japanese War, the Chinese Civil War resumed between the Chinese Communists and the Chinese Nationalists. While the Communists were struggling for supremacy in Manchuria, they were supported by the North Korean government with war materiel and manpower. According to Chinese sources, the North Koreans donated 2,000 railway cars worth of war materiel while thousands of Korean "volunteers" served in the Chinese People's Liberation Army (PLA) during the war. North Korea also provided the Chinese Communist in Manchuria with a safe refuge for non combatants and communications with the rest of China.

The North Korean contributions to the Chinese Communist victory were not forgotten after the creation of the People's Republic of China in 1949. As token of gratitude, between 50,000 to 70,000 Korean veterans that served in PLA were sent back along with their weapons, and they would later play a significant role in the initial invasion of South Korea. The Chinese promised to support the North Koreans in the event of a civil war against South Korea. The Chinese support created a deep division between the Korean Communists, and Kim Il-Sung's authority within the Communist party was challenged by the Chinese faction led by Pak Il-yu, who was later purged by Kim.

After the formation of the People's Republic of China, the Chinese government named the Western nations, led by the United States, as their biggest threat to national security. Basing their judgments on China's century of humiliation, the American support for the Nationalists during the Chinese Civil War, and the ideological struggles between revolutionaries and and reactionaries, the Chinese leadership believed that China would become a critical battleground in the United States' crusade against Communism. As a countermeasure and to elevate China's standing among Communist movements, the Chinese leadership adapted a foreign policy that actively promoted Communists revolutions throughout China's peripheral territories.

Korea divided (1945–1949)

See also: Division of Korea

At the Potsdam Conference (July–August 1945), the Allies unilaterally decided to divide Korea—without consulting the Koreans—in contradiction of the Cairo Conference.

On 8 September 1945, Lt. Gen. John R. Hodge of the United States arrived in Incheon to accept the Japanese surrender south of the 38th parallel. Appointed as military governor, General Hodge directly controlled South Korea via the United States Army Military Government in Korea (USAMGIK 1945–48). He established control by restoring to power the key Japanese colonial administrators and their Korean police collaborators. The USAMGIK refused to recognise the provisional government of the short-lived People's Republic of Korea (PRK) because he suspected it was communist. These policies, voiding popular Korean sovereignty, provoked the civil insurrections and guerrilla warfare. On 3 September 1945, Lieutenant General Yoshio Kozuki, Commander, Japanese Seventeenth Area Army, contacted Hodge, telling him that the Soviets were south of the 38th parallel at Kaesong. Hodge trusted the accuracy of the Japanese Army report.

In December 1945, Korea was administered by a US–USSR Joint Commission, as agreed at the Moscow Conference (1945). The Koreans were excluded from the talks. The commission decided the country would become independent after a five-year trusteeship action facilitated by each régime sharing its sponsor's ideology. The Korean populace revolted; in the south, some protested, and some rose in arms; to contain them, the USAMGIK banned strikes on 8 December 1945 and outlawed the PRK Revolutionary Government and the PRK People's Committees on 12 December 1945.

On 23 September 1946 an 8,000-strong railroad worker strike began in Pusan. Civil disorder spread throughout the country in what became known as the Autumn uprising. On 1 October 1946, Korean police killed three students in the Daegu Uprising; protesters counter-attacked, killing 38 policemen. On 3 October, some 10,000 people attacked the Yeongcheon police station, killing three policemen and injuring some 40 more; elsewhere, some 20 landlords and pro-Japanese South Korean officials were killed. The USAMGIK declared martial law.

The right-wing Representative Democratic Council, led by nationalist Syngman Rhee, opposed the Soviet–American trusteeship of Korea, arguing that after 35 years (1910–45) of Japanese colonial rule most Koreans opposed another foreign occupation. The USAMGIK decided to forego the five year trusteeship agreed upon in Moscow, given the 31 March 1948 United Nations election deadline to achieve an anti-communist civil government in the US Korean Zone of Occupation.

On 3 April what began as a demonstration commemorating Korean resistance to Japanese rule ended with the Jeju massacre of as many as 60,000 citizens by South Korean soldiers.

On 10 May, South Korea convoked their first national general elections that the Soviets first opposed, then boycotted, insisting that the US honor the trusteeship agreed to at the Moscow Conference.

The resultant anti-communist South Korean government promulgated a national political constitution on 17 July 1948, elected a president, the American-educated strongman Syngman Rhee on 20 July 1948. The elections were marred by terrorism and sabotage resulting in 600 deaths. The Republic of South Korea was established on 15 August 1948. In the Russian Korean Zone of Occupation, the USSR established a Communist North Korean government led by Kim Il-sung. President Rhee's régime expelled communists and leftists from southern national politics. Disenfranchised, they headed for the hills, to prepare for guerrilla war against the US-sponsored ROK Government.

As nationalists, both Syngman Rhee and Kim Il-Sung were intent upon reunifying Korea under their own political system. With Joseph Stalin and Mao Zedong fighting over the control of the Korean Peninsula, the North Koreans gained support from both the Soviet Union and the People's Republic of China. They escalated the continual border skirmishes and raids and then prepared to invade. South Korea, with limited materiel, could not match them. During this era, at the beginning of the Cold War, the US government assumed that all communists, regardless of nationality, were controlled or directly influenced by Moscow; thus the US portrayed the civil war in Korea as a Soviet hegemonic maneuver.

In October 1948, South Korean left-wing soldiers rebelled against the government's harsh clampdown in April on Jeju island in the Yeosu-Suncheon Rebellion.

U.S. troops withdrew from Korea in 1949, leaving the South Korean army relatively ill-equipped. The Soviet Union left Korea in 1948. On 24 December 1949, South Korean forces killed 86 to 88 people in the Mungyeong massacre and blamed the crime on communist marauding bands.

Course of the war

The conflict begins (June 1950)

Territory often changed hands early in the war, until the front stabilized.

After the US missions had left the People's Republic of China, CIA China station officer Douglas Mackiernan volunteered to remain and conduct spy operations. Afterward, he and a team of local CIA mercenaries then escaped China in a months-long horse trek across the Himalaya mountains; he was killed within miles of Lhasa. His team delivered the intelligence to headquarters that invasion was imminent. Thirteen days later, the North Korean People's Army (KPA) crossed the 38th parallel border and invaded South Korea. Mackiernan was posthumously awarded the CIA Intelligence Star for valor.

Under the guise of counter-attacking a South Korean provocation raid, the KPA crossed the 38th parallel behind artillery fire at dawn on Sunday 25 June 1950. The KPA said that Republic of Korea Army (ROK Army) troops, under command of the régime of the "bandit traitor Syngman Rhee", had crossed the border first, and that they would arrest and execute Rhee. Both Korean armies had continually harassed each other with skirmishes and each continually staged raids across the 38th parallel border.

This sketch by war artist Kim Seong-hwan, titled Near Donam Bridge, depicts refugees fleeing Seoul in June 1950 during the early days of the Korean War.

On 27 June, Rhee evacuated from Seoul with government officials. Rhee ordered the Bodo League massacre, which started on 28 June. On 28 June, South Korea bombed the bridge across the Han River to stop the North Korean army.

Early the fighting, South Korea put its forces under the authority of the United Nations Command (Korea).

United Nations Security Council Resolutions

On 25 June 1950, the United Nations Security Council unanimously condemned the North Korean invasion of the Republic of South Korea, with United Nations Security Council Resolution 82. The USSR, a veto-wielding power, boycotted the Council meetings since January 1950, protesting that the Republic of China (Taiwan), not the People's Republic of China, held a permanent seat in the UN Security Council. After debating the matter, the Security Council, on 27 June 1950, published Resolution 83 recommending member state military assistance to the Republic of Korea. On 27 June President Truman ordered US air and sea forces to help the South Korean régime. On 4 July the Soviet Deputy Foreign Minister accused the US of starting armed intervention on behalf of South Korea.

The USSR challenged the legitimacy of the war for several reasons. The ROK Army intelligence upon which Resolution 83 was based came from US Intelligence; North Korea was not invited as a sitting temporary member of the UN, which violated UN Charter Article 32; and the Korean conflict was beyond UN Charter scope, because the initial north–south border fighting was classed as a civil war. The Soviet representative boycotted the UN to prevent Security Council action, and to challenge the legitimacy of the UN action; legal scholars posited that deciding upon an action of this type required the unanimous vote of the five permanent members.

Comparison of military forces

The North Korean Army launched the "Fatherland Liberation War" with a comprehensive air–land invasion using 231,000 soldiers, who captured scheduled objectives and territory, among them Kaesong, Chuncheon, Uijeongbu, and Ongjin. Their forces included 274 T-34-85 tanks, some 150 Yak fighters, 110 attack bombers, 200 artillery pieces, 78 Yak trainers, and 35 reconnaissance aircraft. In addition to the invasion force, the North Korean KPA had 114 fighters, 78 bombers, 105 T-34-85 tanks, and some 30,000 soldiers stationed in reserve in North Korea. Although each navy consisted of only several small warships, the North Korean and South Korean navies fought in the war as sea-borne artillery for their in-country armies.

In contrast, the ROK Army defenders were vastly unprepared, and the political establishment in the south, while well aware of the threat to the north, were unable to convince American administrators of the reality of the threat. In South to the Naktong, North to the Yalu (1961), R.E. Appleman reports the ROK forces' low combat readiness as of 25 June 1950. The ROK Army had 98,000 soldiers (65,000 combat, 33,000 support), no tanks (they had been requested from the US military, but requests were denied), and a 22–piece air force comprising 12 liaison-type and 10 AT6 advanced-trainer airplanes. There were no large foreign military garrisons in Korea at invasion time, but there were large US garrisons and air forces in Japan.

Within days of the invasion, masses of ROK Army soldiers—of dubious loyalty to the Syngman Rhee régime—were either retreating southwards or were defecting en masse to the north, to the KPA.

Police action: UN intervention (July – August 1950)

US infantry light machine gun position, 20 November 1950

Korean civilians pass an M-46 tank

A GI comforts a grieving infantryman.

Despite the rapid post–Second World War Allied demobilizations, there were substantial US forces occupying Japan; under General Douglas MacArthur's command, they could be made ready to fight the North Koreans. Only the British Commonwealth had comparable forces in the area.

On Saturday, 24 June 1950, US Secretary of State Dean Acheson informed President Truman by telephone, "Mr. President, I have very serious news. The North Koreans have invaded South Korea." Truman and Acheson discussed a US invasion response with defense department principals, who agreed that the United States was obligated to repel military aggression, paralleling it with Adolf Hitler's 1930s aggressions, and said that the mistake of appeasement must not be repeated. In his autobiography, President Truman acknowledged that fighting the invasion was essential to the American goal of the global containment of communism as outlined in the National Security Council Report 68 (NSC-68) (declassified in 1975):

"Communism was acting in Korea, just as Hitler, Mussolini and the Japanese had ten, fifteen, and twenty years earlier. I felt certain that if South Korea was allowed to fall Communist leaders would be emboldened to override nations closer to our own shores. If the Communists were permitted to force their way into the Republic of Korea without opposition from the free world, no small nation would have the courage to resist threat and aggression by stronger Communist neighbors."

President Truman announced that the US would counter "unprovoked aggression" and "vigorously support the effort of the [UN] security council to terminate this serious breach of peace." In Congress, the Joint Chiefs of Staff Chairman General Omar Bradley warned against appeasement, saying that Korea was the place "for drawing the line" against communist expansion. In August 1950, the President and the Secretary of State obtained the consent of Congress to appropriate $12 billion to pay for the military expenses.

Per State Secretary Acheson's recommendation, President Truman ordered General MacArthur to transfer materiel to the Army of the Republic of Korea while giving air cover to the evacuation of US nationals. The President disagreed with advisors who recommended unilateral US bombing of the North Korean forces, and ordered the US Seventh Fleet to protect the Republic of China (Taiwan), whose Nationalist Government asked to fight in Korea. The US denied the Nationalist Chinese request for combat, lest it provoke a communist Chinese retaliation.

The Battle of Osan, the first significant engagement of the Korean War, involved the 540-soldier Task Force Smith, which was a small forward element of the 24th Infantry Division. On 5 July 1950, Task Force Smith attacked the North Koreans at Osan but without weapons capable of destroying the North Koreans' tanks. They were unsuccessful; the result was 180 dead, wounded, or taken prisoner. The KPA progressed southwards, pushing back the US force at Pyongtaek, Chonan, and Chochiwon, forcing the 24th Division's retreat to Taejeon, which the KPA captured in the Battle of Taejon; the 24th Division suffered 3,602 dead and wounded and 2,962 captured, including the Division's Commander, Major General William F. Dean. Overhead, the KPAF shot down 18 USAF fighters and 29 bombers; the USAF shot down five KPAF fighters.

By August, the KPA had pushed back the ROK Army and the Eighth United States Army to the vicinity of Pusan, in southeast Korea. In their southward advance, the KPA purged the Republic of Korea's intelligentsia by killing civil servants and intellectuals. On 20 August, General MacArthur warned North Korean leader Kim Il-Sung that he was responsible for the KPA's atrocities. By September, the UN Command controlled only the Pusan city perimeter, about 10% of Korea, in a line partially defined by the Nakdong River.

Escalation (August – September 1950)

The USAF attacking railroads south of Wonsan on the eastern coast of North Korea.

In the resulting Battle of Pusan Perimeter (August–September 1950), the US Army withstood KPA attacks meant to capture the city at the Naktong Bulge, P'ohang-dong, and Taegu. The United States Air Force interrupted KPA logistics with 40 daily ground support sorties that destroyed 32 bridges, halting most daytime road and rail traffic, which was forced to hide in tunnels and move only at night. To deny materiel to the KPA, the USAF destroyed logistics depots, petroleum refineries, and harbors, while the US Navy air forces attacked transport hubs. Consequently, the over-extended KPA could not be supplied throughout the south.

Meanwhile, US garrisons in Japan continually dispatched soldiers and materiel to reinforce the Pusan Perimeter. Tank battalions deployed to Korea from San Francisco; by late August, the Pusan Perimeter had some 500 medium tanks. In early September 1950, ROK Army and UN Command forces outnumbered the KPA 180,000 to 100,000 soldiers. They counterattacked.

Battle of Inchon (September 1950)

Main article: Battle of Inchon

General Douglas MacArthur, UN Command CiC (seated), observes the naval shelling of Incheon from the USS Mt. McKinley, 15 September 1950.

Against the rested and re-armed Pusan Perimeter defenders and their reinforcements, the KPA were undermanned and poorly supplied; unlike the UN Command, they lacked naval and air support. To relieve the Pusan Perimeter General MacArthur recommended an amphibious landing at Incheon, behind the KPA lines. On 6 July, he ordered Major General Hobart R. Gay, Commander, 1st Cavalry Division, to plan the division's amphibious landing at Incheon; but on 12–14 July, the 1st Cavalry Division embarked from Yokohama to reinforce the 24th Infantry Division inside the Pusan Perimeter.

Soon after the war began, General MacArthur had begun planning a landing at Incheon, but the Pentagon opposed him. When authorized, he activated a combined United States Army, United States Marine Corps, and ROK Army force. The X Corps, led by General Edward Almond, Commander, consisted of 40,000 men of the 1st Marine Division, the 7th Infantry Division and around 8,600 ROK Army soldiers. By the 15 September attack date, the amphibious assault force faced few KPA defenders at Incheon: military intelligence, psychological warfare, guerrilla reconnaissance, and protracted bombardment facilitated a relatively light battle. However, the bombardment destroyed most of the city of Incheon.

After the Incheon landing the 1st Cavalry Division began its northward advance from the Pusan Perimeter. "Task Force Lynch"—3rd Battalion, 7th Cavalry Regiment, and two 70th Tank Batallion units (Charlie Company and the Intelligence–Reconnaissance Platoon)—effected the "Pusan Perimeter Breakout" through 106.4 miles (171.2 km) of enemy territory to join the 7th Infantry Division at Osan. The X Corps rapidly defeated the KPA defenders around Seoul, thus threatening to trap the main KPA force in Southern Korea. The almost-isolated KPA troops rapidly retreated north, but only 25,000 to 30,000 soldiers managed to reach the Northern KPA lines.

UN forces cross partition line (September – October 1950)

Main article: UN Offensive, 1950

Combat in the streets of Seoul

On September 27, MacArthur received the top secret National Security Council Memorandum 81/1 from Truman reminding him that operations north of the 38th parallel were authorized only if "at the time of such operation there was no entry into North Korea by major Soviet or Chinese Communist forces, no announcements of intended entry, nor a threat to counter our operations militarily…" On September 30, Defense Secretary George Marshall sent an eyes-only message to MacArthur: "We want you to feel unhampered tactically and strategically to proceed north of the 38th parallel."

On 1 October 1950, the UN Command repelled the KPA northwards, past the 38th parallel; the ROK Army crossed after them, into North Korea. Six days later, on 7 October, with UN authorization, the UN Command forces followed the ROK forces northwards. The X Corps landed at Wonsan (in southeastern North Korea) and Riwon (in northeastern North Korea), already captured by ROK forces. The Eighth United States Army and the ROK Army drove up western Korea and captured Pyongyang city, the North Korean capital, on 19 October 1950. At month's end, UN forces held 135,000 KPA prisoners of war.

Taking advantage of the UN Command's strategic momentum against the communists, General MacArthur believed it necessary to extend the Korean War into China to destroy depots supplying the North Korean war effort. President Truman disagreed, and ordered caution at the Sino-Korean border.

China intervenes (October – December 1950)

Chinese infantrymen, 1952

On 27 June 1950, two days after the KPA invaded and three months before the Chinese entered the war, President Truman dispatched the United States Seventh Fleet to the Taiwan Strait, to protect the Nationalist Republic of China (Taiwan) from the People's Republic of China (PRC). On 4 August 1950, with the PRC invasion of Taiwan aborted, Mao Zedong reported to the Politburo that he would intervene in Korea when the People's Liberation Army's (PLA) Taiwan invasion force was reorganized into the PLA North East Frontier Force.

On 20 August 1950, Premier Zhou Enlai informed the United Nations that "Korea is China's neighbor ... The Chinese people cannot but be concerned about a solution of the Korean question". Thus, via neutral-country diplomats, China warned that in safeguarding Chinese national security, they would intervene against the UN Command in Korea. President Truman interpreted the communication as "a bald attempt to blackmail the UN", and dismissed it. The Politburo authorized Chinese intervention in Korea on 2 October 1950, the day after the ROK Army crossed the 38th parallel. Later, the Chinese claimed that US bombers had violated PRC national airspace while en route to bomb North Korea, before China intervened.

In September, in Moscow, PRC Premier Zhou Enlai added diplomatic and personal force to Mao's cables to Stalin, requesting military assistance and materiel. Stalin delayed; Mao rescheduled launching the war from the 13th to the 19th of October 1950. The USSR limited their assistance to air support north of the Yalu River. Mao did not find this especially useful as the fighting was going to take place on the south side of the river. Soviet shipments of war materiel were limited to small quantities of trucks, grenades, machine guns, and the like.

On 8 October 1950, Mao Zedong redesignated the PLA North East Frontier Force as the Chinese People's Volunteer Army (PVA), who were to fight the "War to Resist America and Aid Korea" under the command of Marshal Peng Dehuai.

Artillerymen manning a 105 mm howitzer, Uirson, Korea, August 1950

UN aerial reconnaissance had difficulty sighting PVA units in daytime, because their march and bivouac discipline minimized aerial detection. The PVA marched "dark-to-dark" (19:00–03:00), and aerial camouflage (concealing soldiers, pack animals, and equipment) was deployed by 05:30. Meanwhile, daylight advance parties scouted for the next bivouac site. During daylight activity or marching, soldiers were to remain motionless if an aircraft appeared, until it flew away; PVA officers might shoot security violators. Such battlefield discipline allowed a three-division army to march the 286 miles (460 km) from An-tung, Manchuria to the combat zone in some 19 days. Another division night-marched a circuitous mountain route, averaging 18 miles (29 km) daily for 18 days.

Meanwhile, on 10 October 1950, the 89th Tank Battalion was attached to the 1st Cavalry Division, increasing the armor available for the Northern Offensive. On 15 October, after moderate KPA resistance, the 7th Cavalry Regiment and Charlie Company, 70th Tank Battalion captured Namchonjam city. On 17 October, they flanked rightwards, away from the principal road (to Pyongyang), to capture Hwangju. Two days later, the 1st Cavalry Division captured Pyongyang, the capital city, on 19 October 1950.

On 15 October 1950, President Truman and General MacArthur met at Wake Island in the mid-Pacific Ocean, for a meeting much publicized because of the General's discourteous refusal to meet the President in the US. To President Truman, MacArthur speculated there was little risk of Chinese intervention to Korea; that the PRC's opportunity for aiding the KPA had elapsed; that the PRC had some 300,000 soldiers in Manchuria, and some 100,000–125,000 soldiers at the Yalu River; concluding that, although half of those forces might cross south, "if the Chinese tried to get down to Pyongyang, there would be the greatest slaughter" without air force protection.

Map of the Battle of Chosin Reservoir

After secretly crossing the Yalu River on 15 October, the PVA 13th Army Group launched the First Phase Offensive on 25 October, attacking the advancing UN forces near the Sino-Korean border. After decimating the ROK II Corps at the Battle of Onjong, the first confrontation between Chinese and US military occurred on 1 November 1950; deep in North Korea, thousands of soldiers from the PVA 39th Army encircled and attacked the US 8th Cavalry Regiment with three-prong assaults—from the north, northwest, and west—and overran the defensive position flanks in the Battle of Unsan. The surprise assault forced the UN forces to retreat back to the Ch'ongch'on River, while the Chinese unexpectedly disappeared in their mountain hideouts following their victory.

The UN Command, however, were unconvinced that the Chinese had openly intervened due to the sudden Chinese withdrawal. On 24 November, the Home-by-Christmas Offensive was launched with the US Eighth Army advancing in northwest Korea, while the US X Corps were attacking along the Korean east coast. But the Chinese were waiting in ambush with their Second Phase Offensive.

On 25 November at the Korean western front, the PVA 13th Army Group attacked and over-ran the ROK II Corps at the Battle of the Ch'ongch'on River, and then decimated the US 2nd Infantry Division on the UN forces' right flank. The UN Command retreated; the US Eighth Army's retreat (the longest in US Army history) was made possible because of the Turkish Brigade's successful, but very costly, rear-guard delaying action near Kunuri that slowed the PVA attack for two days (27–29 November). On 27 November at the Korean eastern front, a US 7th Infantry Division Regimental Combat Team (3,000 soldiers) and the US 1st Marine Division (12,000–15,000 marines) were unprepared for the PVA 9th Army Group's three-pronged encirclement tactics at the Battle of Chosin Reservoir, but they managed to escape under X Corps support fire—albeit with some 15,000 collective casualties.

By 30 November, the PVA 13th Army Group managed to expel the US Eighth Army from northwest Korea. Retreating from the north faster than they had counter-invaded, the Eighth Army crossed the 38th parallel border in mid December. The UN morale hit rock bottom when commanding General Walton Walker of the US Eighth Army was killed on 23 December 1950 in an automobile accident. At northeast Korea by 11 December, the US X Corps managed to cripple the PVA 9th Army Group while establishing a defensive perimeter at the port city of Hungnam. They were forced to evacuate by 24 December in order to reinforce the badly depleted US Eighth Army to the south.

During the Hungnam evacuation, about 193 shiploads of UN Command forces and materiel (approximately 105,000 soldiers, 98,000 civilians, 17,500 vehicles, and 350,000 tons of supplies) were evacuated to Pusan. The SS Meredith Victory was noted for evacuating 14,000 refugees, the largest rescue operation by a single ship, even though it was designed to hold only 12 passengers. Before escaping, the UN Command forces effected scorched earth operations, razing most of Hungam city, especially the port facilities; and on 16 December 1950, President Truman declared a national emergency with Presidential Proclamation No. 2914, 3 C.F.R. 99 (1953), which remained in force until 14 September 1978.

Fighting around the 38th parallel (January – June 1951)

B-26 Invaders bomb logistics depots in Wonsan, North Korea, 1951

With Lieutenant-General Matthew Ridgway assuming the command of the US Eighth Army on 26 December, the PVA and the KPA launched their Third Phase Offensive (also known as the "Chinese New Year's Offensive") on New Year's Eve of 1951, utilizing night attacks in which UN Command fighting positions were encircled and then assaulted by numerically superior troops who had the element of surprise. The attacks were accompanied by loud trumpets and gongs, which fulfilled the double purpose of facilitating tactical communication and mentally disorienting the enemy. UN forces initially had no familiarity with this tactic, and as a result some soldiers "bugged out," abandoning their weapons and retreating to the south. The Chinese New Year's Offensive overwhelmed the UN Command forces and the PVA and KPA in the conquered Seoul on 4 January 1951.

These setbacks prompted General MacArthur to consider using nuclear weapons against the Chinese or North Korean interiors, with the intention that the resulting radioactive fallout zones would interrupt the Chinese supply chains. However, upon the arrival of the charismatic General Ridgway, the esprit de corps of the bloodied Eighth Army immediately began to revive.

UN forces retreated to Suwon in the west, Wonju in the center, and the territory north of Samcheok in the east, where the battlefront stabilized and held. The PVA had outrun its logistics and thus was forced to recoil from pressing the attack beyond Seoul; food, ammunition, and materiel were carried nightly, on foot and bicycle, from the border at the Yalu River to the three battle lines. In late January, upon finding that the enemy had abandoned the battle lines, General Ridgway ordered a reconnaissance-in-force, which became Operation Roundup (5 February 1951), a full-scale X Corps advance that gradually proceeded while fully exploiting the UN Command's air superiority, concluding with the UN reaching the Han River and recapturing Wonju.

In mid-February, the PVA counterattacked with the Fourth Phase Offensive and achieved a victory at Hoengseong. But the offensive was soon blunted by the IX Corps positions at Chipyong-ni in the center. Units of the US 2nd Infantry Division and the French Battalion fought a short but desperate battle that broke the attack's momentum.

In the last two weeks of February 1951, Operation Roundup was followed by Operation Killer, carried out by the revitalized Eighth Army. It was a full-scale, battlefront-length attack staged for maximum exploitation of firepower to kill as many KPA and PVA troops as possible. Operation Killer concluded with I Corps re-occupying the territory south of the Han River, and IX Corps capturing Hoengseong. On 7 March 1951, the Eighth Army attacked with Operation Ripper, expelling the PVA and the KPA from Seoul on 14 March 1951. This was the city's fourth conquest in a years' time, leaving it a ruin; the 1.5 million pre-war population was down to 200,000, and people were suffering from severe food shortages.

On 11 April 1951, Commander-in-Chief Truman relieved the controversial General MacArthur, the Supreme Commander in Korea, of duty. There were several reasons for the dismissal. MacArthur had crossed the 38th parallel in the mistaken belief that the Chinese would not enter the war, leading to major losses. He believed that whether or not to use nuclear weapons should be his own decision, not the President's. MacArthur threatened to destroy China unless it surrendered. While MacArthur felt total victory was the only honorable outcome, Truman was more pessimistic about his chances once involved in a land war in Asia, and felt a truce and orderly withdrawal from Korea could be a valid solution. MacArthur was the subject of congressional hearings in May and June 1951, which determined that he had defied the orders of the President and thus had violated the US Constitution. MacArthur never spent a night in Korea and directed the war from Tokyo.

General Ridgway was appointed Supreme Commander, Korea; he regrouped the UN forces for successful counterattacks, while General James Van Fleet assumed command of the US Eighth Army. Further attacks slowly repelled the PVA and KPA forces; Operations Courageous (23–28 March 1951) and Tomahawk (23 March 1951) were a joint ground and air assault meant to trap Chinese forces between Kaesong and Seoul. UN forces advanced to "Line Kansas", north of the 38th parallel.

The Chinese counterattacked in April 1951, with the Fifth Phase Offensive (also known as the "Chinese Spring Offensive") with three field armies (approximately 700,000 men). The offensive's first thrust fell upon I Corps, which fiercely resisted in the Battle of the Imjin River (22–25 April 1951) and the Battle of Kapyong (22–25 April 1951), blunting the impetus of the offensive, which was halted at the "No-name Line" north of Seoul. On 15 May 1951, the Chinese commenced the second impulse of the Spring Offensive and attacked the ROK Army and the US X Corps in the east, and initially were successful, yet were halted by 20 May. At month's end, the US Eighth Army counterattacked and regained "Line Kansas", just north of the 38th parallel. The UN's "Line Kansas" halt and subsequent offensive action stand-down began the stalemate that lasted until the armistice of 1953.

Stalemate (July 1951 – July 1953)

Korean personnel unload logs that are to be used to construct bunkers.

File:Battle of Triangle Hill Artillery Shells.jpg

ROK soldiers dump spent artillery casings.

For the remainder of the Korean War the UN Command and the PVA fought, but exchanged little territory; the stalemate held. Large-scale bombing of North Korea continued, and protracted armistice negotiations began 10 July 1951 at Kaesong. Combat continued while the belligerents negotiated; the UN Command forces' goal was to recapture all of South Korea to avoid losing territory. The PVA and the KPA attempted similar operations, and later they effected military and psychological operations in order to test the UN Command's resolve to continue the war.

The principal battles of the stalemate include the Battle of Bloody Ridge (18 August – 15 September 1951), the Battle of Heartbreak Ridge (13 September – 15 October 1951), the Battle of Old Baldy (26 June – 4 August 1952), the Battle of White Horse (6–15 October 1952), the Battle of Triangle Hill (14 October – 25 November 1952), the Battle of Hill Eerie (21 March – 21 June 1952), the sieges of Outpost Harry (10–18 June 1953), the Battle of the Hook (28–29 May 1953) and the Battle of Pork Chop Hill (23 March – 16 July 1953).

Armistice (July 1953 – November 1954)

The armistice negotiations continued for two years, first at Kaesong (southern North Korea), then at Panmunjom (bordering the Koreas). A major, problematic negotiation was prisoner of war (POW) repatriation. The PVA, KPA, and UN Command could not agree on a system of repatriation because many PVA and KPA soldiers refused to be repatriated back to the north, which was unacceptable to the Chinese and North Koreans. In the final armistice agreement, a Neutral Nations Repatriation Commission was set up to handle the matter.

In 1952 the US elected a new president, and on 29 November 1952, the president-elect, Dwight D. Eisenhower, went to Korea to learn what might end the Korean War. With the United Nations' acceptance of India's proposed Korean War armistice, the KPA, the PVA, and the UN Command ceased fire on 27 July 1953, with the battle line approximately at the 38th parallel. Upon agreeing to the armistice, the belligerents established the Korean Demilitarized Zone (DMZ), which has since been defended by the KPA and ROKA, US, and UN Commands.

The Demilitarized Zone runs northeast of the 38th parallel; to the south, it travels west. The old Korean capital city of Kaesong, site of the armistice negotiations, originally lay in the pre-war ROK, but now is in the DPRK. The United Nations Command, supported by the United States, the North Korean Korean People's Army, and the Chinese People's Volunteers, signed the Armistice Agreement to end the fighting. The Armistice also called upon the governments of South Korea, North Korea, China and the United States to participate in peace talks in future. For his part, ROK President Rhee attacked the peace proceedings.

After the war, Operation Glory (July–November 1954) was conducted to allow combatant countries to exchange their dead. The remains of 4,167 US Army and US Marine Corps dead were exchanged for 13,528 KPA and PVA dead, and 546 civilians dead in UN prisoner-of-war camps were delivered to the ROK government. After Operation Glory, 416 Korean War unknown soldiers were buried in the National Memorial Cemetery of the Pacific (The Punchbowl), Hawaii. Defense Prisoner of War/Missing Personnel Office (DPMO) records indicate that the PRC and the DPRK transmitted 1,394 names, of which 858 were correct. From 4,167 containers of returned remains, forensic examination identified 4,219 individuals. Of these, 2,944 were identified as American, and all but 416 were identified by name. From 1996 to 2006, the DPRK recovered 220 remains near the Sino-Korean border.

Characteristics

Casualties

Korean War memorials are found in every UN Command Korean War participant country; this one is in Pretoria, South Africa.

The Western (US–UN Command) statistics for the number of Chinese and North Korean casualties are primarily based upon calculated battlefield casualty reports, POW interrogations, and military intelligence (documents, spies, etc.); one compilation is the democide web site (see Table 10.1). The Korean War dead: US: 36,940 killed; PVA: 100,000–1,500,000 killed; most estimate some 400,000 killed; KPA: 214,000–520,000; most estimate some 500,000. ROK: Civilian: some 245,000–415,000 killed; Total civilians killed some 1,500,000–3,000,000; most estimate some 2,000,000 killed.

The PVA and KPA published a joint declaration after the war reporting that the armies had "eliminated 1.09 million enemy forces, including 390,000 from the United States, 660,000 from South Korean [sic], and 29,000 from other countries." No breakdown was given for the number of dead, wounded, and captured, which Chinese researcher Xu Yan suggests may have aided negotiations for POW repatriation.

Xu writes that the PVA "suffered 148,000 deaths altogether, among which 114,000 died in combats [sic], incidents, and winterkill, 21,000 died after being hospitalized, 13,000 died from diseases; and 380,000 were wounded. There were also 29,000 missing, including 21,400 POWs, of whom 14,000 were sent to Taiwan, 7,110 were repatriated." For the KPA, Xu cites 290,000 casualties, 90,000 POWs, and a "large" number of civilian deaths in the north.

Armored warfare

Supporting the 8th ROK Army Division, a Sherman tank fires its 76 mm gun at KPA bunkers at "Napalm Ridge", Korea, 11 May 1952.

Initially, North Korean armor dominated the battlefield with Soviet T-34-85 medium tanks designed during the Second World War. The KPA's tanks confronted a tankless ROK Army armed with few modern anti-tank weapons, including World War II–model 2.36-inch (60 mm) M9 bazookas, effective only against the 45 mm side armor of the T-34-85 tank. The US forces arriving in Korea were equipped with light M24 Chaffee tanks (on occupation duty in nearby Japan) that also proved ineffective against the heavier KPA T-34 tanks.

During the initial hours of warfare, some under-equipped ROK Army border units used 105 mm howitzers as anti-tank guns to stop the tanks heading the KPA columns, firing high-explosive anti-tank ammunition (HEAT) over open sights to good effect; at the war's start, the ROK Army had 91 such guns, but lost most to the invaders.

Countering the initial combat imbalance, the UN Command reinforcement materiel included heavier US M4 Sherman, M26 Pershing, M46 Patton, and British Cromwell and Centurion tanks that proved effective against North Korean armor, ending its battlefield dominance. Unlike in the Second World War (1939–45), in which the tank proved a decisive weapon, the Korean War featured few large-scale tank battles. The mountainous, heavily forested terrain prevented large masses of tanks from maneuvering. In Korea, tanks served largely as infantry support.

Aerial warfare

Further information: MiG Alley, USAF Units and Aircraft of the Korean War, and Korean People's Air Force

MiG Alley: A MiG-15 shot down by an F-86 Sabre

The KPAF shot down some 16 B-29 Superfortress bombers in the war.

A US Navy Sikorsky H-19 Chickasaw flying near the USS Sicily

The Korean War was the first war in which jet aircraft played a central role. Once-formidable fighters such as the P-51 Mustang, F4U Corsair, and Hawker Sea Fury—all piston-engined, propeller-driven, and designed during World War II—relinquished their air superiority roles to a new generation of faster, jet-powered fighters arriving in the theater. For the initial months of the war, the P-80 Shooting Star, F9F Panther, and other jets under the UN flag dominated North Korea's prop-driven air force of Soviet Yakovlev Yak-9 and Lavochkin La-9s. The balance would shift, however, with the arrival of the swept wing Soviet MiG-15 Fagot.

The Chinese intervention in late October 1950 bolstered the Korean People's Air Force (KPAF) of North Korea with the MiG-15 Fagot, one of the world's most advanced jet fighters. The fast, heavily armed MiG outflew first-generation UN jets such as the American F-80 and Australian and British Gloster Meteors, posing a real threat to B-29 Superfortress bombers even under fighter escort. Soviet Air Force pilots flew missions for the North to learn the West's aerial combat techniques. This direct Soviet participation is a casus belli that the UN Command deliberately overlooked, lest the war for the Korean peninsula expand, as the US initially feared, to include three communist countries—North Korea, the Soviet Union, and China—and so escalate to atomic warfare.

The United States Air Force (USAF) moved quickly to counter the MiG-15, with three squadrons of its most capable fighter, the F-86 Sabre, arriving in December 1950. Although the MiG's higher service ceiling—50,000 feet (15,000 m) vs. 42,000 feet (13,000 m)—could be advantageous at the start of a dogfight, in level flight, both swept wing designs attained comparable maximum speeds of around 660 mph (1,100 km/h). The MiG climbed faster, but the Sabre turned and dove better. The MiG was armed with one 37 mm and two 23 mm cannons, while the Sabre carried six .50 caliber (12.7 mm) machine guns aimed with radar-ranged gunsights.

By early 1951, the battle lines were established and changed little until 1953. In summer and autumn 1951, the outnumbered Sabres of the USAF's 4th Fighter Interceptor Wing—only 44 at one point—continued seeking battle in MiG Alley, where the Yalu River marks the Chinese border, against Chinese and North Korean air forces capable of deploying some 500 aircraft. Following Colonel Harrison Thyng's communication with the Pentagon, the 51st Fighter-Interceptor Wing finally reinforced the beleaguered 4th Wing in December 1951; for the next year-and-a-half stretch of the war, aerial warfare continued.

UN forces gradually gained air superiority in the Korean theater. This was decisive for the UN: first, for attacking into the peninsular north, and second, for resisting the Chinese intervention. North Korea and China also had jet-powered air forces; their limited training and experience made it strategically untenable to lose them against the better-trained UN air forces. Thus, the US and USSR fed materiel to the war, battling by proxy and finding themselves virtually matched, technologically, when the USAF deployed the F-86F against the MiG-15 late in 1952.

After the war, the USAF reported an F-86 Sabre kill ratio in excess of 10:1, with 792 MiG-15s and 108 other aircraft shot down by Sabres, and 78 Sabres lost to enemy fire; post-war data confirms only 379 Sabre kills. The Soviet Air Force reported some 1,100 air-to-air victories and 335 MiG combat losses, while China's People's Liberation Army Air Force (PLAAF) reported 231 combat losses, mostly MiG-15s, and 168 other aircraft lost. The KPAF reported no data, but the UN Command estimates some 200 KPAF aircraft lost in the war's first stage, and 70 additional aircraft after the Chinese intervention. The USAF disputes Soviet and Chinese claims of 650 and 211 downed F-86s, respectively, as more recent US figures state only 230 losses out of 674 F-86s deployed to Korea. The differing tactical roles of the F-86 and MiG-15 may have contributed to the disparity in losses: MiG-15s primarily targeted B-29 bombers and ground-attack fighter-bombers, while F-86s targeted the MiGs.

The Korean War marked a major milestone not only for fixed-wing aircraft, but also for rotorcraft, featuring the first large-scale deployment of helicopters for medical evacuation (medevac). In the Second World War (1939–45), the YR-4 helicopter saw limited ambulance duty, but in Korea, where rough terrain trumped the jeep as a speedy medevac vehicle, helicopters like the Sikorsky H-19 helped reduce fatal casualties to a dramatic degree when combined with complementary medical innovations such as Mobile Army Surgical Hospitals. The limitations of jet aircraft for close air support highlighted the helicopter's potential in the role, leading to development of the AH-1 Cobra and other helicopter gunships used in the Vietnam War (1965–75).

Bombing North Korea

On 12 August 1950 the USAF dropped 625 tons of bombs on North Korea; two weeks later, the daily tonnage increased to some 800 tons.

As a result, eighteen of North Korea's cities were more than 50% destroyed. The war's highest-ranking American POW, US Major General William F. Dean, reported that most of the North Korean cities and villages he saw were either ruins or snow-covered wastelands.

Naval warfare

To disrupt North Korean communications, the USS Missouri fires a salvo from its 16-inch guns. Chongjin, North Korea, 21 October 1950

Because the North Korean navy was not large, the Korean War featured few naval battles; mostly the combatant navies served as naval artillery for their in-country armies. A skirmish between North Korea and the UN Command occurred on 2 July 1950; the US Navy cruiser USS Juneau, the Royal Navy cruiser HMS Jamaica, and the frigate HMS Black Swan fought four North Korean torpedo boats and two mortar gunboats, and sank them.

The UN navies sank supply and ammunition ships to deny the sea to North Korea. The USS Juneau sank ammunition ships that had been present in her previous battle. The last sea battle of the Korean War occurred at Inchon, days before the Battle of Incheon; the ROK ship PC 703 sank a North Korean mine layer in the Battle of Haeju Island, near Inchon. Three other supply ships were sunk by PC-703 two days later in the Yellow Sea.

U.S. threat of atomic warfare

On 5 April 1950, the Joint Chiefs of Staff (JCS) issued orders for the retaliatory atomic bombing of Manchurian PRC military bases, if either their armies crossed into Korea or if PRC or KPA bombers attacked Korea from there. The President ordered the transfer of nine Mark 4 nuclear bombs "to the Air Force's Ninth Bomb Group, the designated carrier of the weapons ... [and] signed an order to use them against Chinese and Korean targets", which he never transmitted.

President Truman did not immediately threaten nuclear warfare after the October 1950 Chinese intervention, but, 45 days later, remarked about the possibility of using it after the PVA repelled the UN Command from North Korea.

In The Origins of the Korean War (1981, 1990), US historian Bruce Cumings reports that in a 30 November 1950 press conference, President Truman's allusions to attacking the KPA with nuclear weapons "was a threat based on contingency planning to use the bomb, rather than the faux pas so many assumed it to be." On 30 November 1950, the USAF Strategic Air Command was ordered to "augment its capacities, and that this should include atomic capabilities."

The Indian Ambassador, Kavalam Panikkar, reports "that Truman announced that he was thinking of using the atom bomb in Korea. But the Chinese seemed totally unmoved by this threat ... The propaganda against American aggression was stepped up. The 'Aid Korea to resist America' campaign was made the slogan for increased production, greater national integration, and more rigid control over anti-national activities. One could not help feeling that Truman's threat came in very useful to the leaders of the Revolution, to enable them to keep up the tempo of their activities."

Atom bomb test, 1951

President Truman remarked that his government was actively considering using the atomic bomb to end the war in Korea but that only he—the US President—commanded atomic bomb use, and that he had not given authorization. The matter of atomic warfare was solely a US decision, not the collective decision of the UN. Truman met on 4 December 1950 with UK prime minister and Commonwealth spokesman Clement Attlee, French Premier René Pleven, and Foreign Minister Robert Schuman to discuss their worries about atomic warfare and its likely continental expansion. The US's forgoing atomic warfare was not because of "a disinclination by the USSR and PRC to escalate" the Korean War, but because UN allies—notably from the UK, the Commonwealth, and France—were concerned about a geopolitical imbalance rendering NATO defenseless while the US fought China, who then might persuade the USSR to conquer Western Europe.

On 6 December 1950, after the Chinese intervention repelled the UN Command armies from northern North Korea, General J. Lawton Collins (Army Chief of Staff), General MacArthur, Admiral C. Turner Joy, General George E. Stratemeyer, and staff officers Major General Doyle Hickey, Major General Charles A. Willoughby, and Major General Edwin K. Wright, met in Tokyo to plan strategy countering the Chinese intervention; they considered three potential atomic warfare scenarios encompassinging the next weeks and months of warfare.

• In the first scenario: If the PVA continued attacking in full and the UN Command is forbidden to blockade and bomb China, and without Nationalist Chinese reinforcements, and without an increase in US forces until April 1951 (four National Guard divisions were due to arrive), then atomic bombs might be used in North Korea.

• In the second scenario: If the PVA continued full attacks and the UN Command have blockaded China and have effective aerial reconnaissance and bombing of the Chinese interior, and the Nationalist Chinese soldiers are maximally exploited, and tactical atomic bombing is to hand, then the UN forces could hold positions deep in North Korea.

• In the third scenario: if the PRC agreed to not cross the 38th parallel border, General MacArthur recommended UN acceptance of an armistice disallowing PVA and KPA troops south of the parallel, and requiring PVA and KPA guerrillas to withdraw northwards. The US Eighth Army would remain to protect the Seoul–Incheon area, while X Corps would retreat to Pusan. A UN commission should supervise implementation of the armistice.

In 1951, the US escalated closest to atomic warfare in Korea. Because the PRC had deployed new armies to the Sino-Korean frontier, pit crews at the Kadena Air Base, Okinawa, assembled atomic bombs for Korean warfare, "lacking only the essential pit nuclear cores." In October 1951, the US effected Operation Hudson Harbor to establish nuclear weapons capability. USAF B-29 bombers practised individual bombing runs from Okinawa to North Korea (using dummy nuclear or conventional bombs), coordinated from Yokota Air Base in east-central Japan. Hudson Harbor tested "actual functioning of all activities which would be involved in an atomic strike, including weapons assembly and testing, leading, ground control of bomb aiming". The bombing run data indicated that atomic bombs would be tactically ineffective against massed infantry, because the "timely identification of large masses of enemy troops was extremely rare."

War crimes

Civilian deaths and massacres

Further information: Hangang Bridge bombing, Yongsan bombing, No Gun Ri Massacre, Geochang massacre, Sancheong-Hamyang massacre, and Ganghwa massacre

MEMO (25 Jul ’50) to Gen. Timberlake, USAF; SUBJECT: Policy on Strafing Civilian Refugees:
It is reported that large groups of civilians, either composed of or controlled by North Korean soldiers, are infiltrating US positions. The army has requested we strafe all civilian refugee parties approaching our positions. To date, we have complied with the army request in this respect.

In occupied areas, North Korean Army political officers purged South Korean society of its intelligentsia by assassinating every educated person—academic, governmental, religious—who might lead resistance against the North; the purges continued during the NPA retreat. Immediately after the invasion in June 1950 the South Korean Government ordered the nation-wide "pre-emptive apprehension" of politically suspect or disloyal citizens.

The military police and right-wing paramilitary (civilian) armies executed thousands of left-wing and communist political prisoners at Daejeon Prison and in the Jeju Uprising (1948–49). The Americans on the island documented the events, but never intervened.

US diplomat Gregory Henderson, then in Korea, calculates some 100,000 pro-North political prisoners were killed and buried in mass graves. The South Korean Truth and Reconciliation Commission has compiled reports of hundreds of thousands of civilian killings before and during the war.

In addition to conventional military operations, North Korean soldiers fought the UN forces by infiltrating guerrillas among refugees, who would approach soldiers for food and help. For a time, US troops fought under a "shoot-first-ask-questions-later" policy against every civilian refugee approaching US battlefield positions, a policy that led US Soldiers to kill between 8 and 400 civilians at No Gun Ri (26–29 July 1950) in central Korea because they believed some of the people killed might be North Korean soldiers in disguise.

The Korean armies forcibly conscripted available civilian men and women to their war efforts. In Statistics of Democide (1997), Prof. R. J. Rummel reports that the North Korean Army conscripted some 400,000 South Korean citizens. The South Korean Government reported that before the US recaptured Seoul in September 1950, the North abducted some 83,000 citizens; the North says they defected.

Bodo League anti–communist massacre

ROK soldiers walk among the bodies of political prisoners executed near Daejon, July 1950

Main article: Bodo League massacre

To outmaneuver a possible fifth column in the Republic of Korea, President Syngman Rhee's régime assassinated its "enemies of the state"—South Koreans suspected of being communists, pro-North Korea, and leftist—by first imprisoning them for political re-education in the Gukmin Bodo Ryeonmaeng (National Rehabilitation and Guidance League, also known as the Bodo League). The true purpose of the anti–communist Bodo League, abetted by the United States Army Military Government in Korea (USAMGIK), was the régime's assassination of some 10,000 to 100,000 "enemies of the state" whom they dumped in trenches, mines, and the sea, before and after the 25 June 1950 North Korean invasion. Contemporary calculations report some 200,000 to 1,200,000. USAMGIK officers were present at one political execution site; at least one US officer sanctioned the mass killings of political prisoners whom the North Koreans would have freed after conquering the peninsular south.

The South Korean Truth and Reconciliation Commission reports that petitions requesting explanation of the summary execution of leftist South Koreans outnumber, six-to-one, the petitions requesting explanation of the summary execution of rightist South Koreans. These data apply solely to South Korea, because North Korea is not integral to the Truth and Reconciliation Commission. The father of Bodo League massacre survivor Kim Jong-chol was press-ganged to work with the KPA and later executed by the Rhee Government as a collaborator; his grandparents and a seven-year-old sister also were assassinated. About his experience in Namyangju city, he says:

Young children or whatever, were all killed en masse. What did the family do wrong? Why did they kill the family? When the people from the other side [North Korea] came here, they didn't kill many people.

— Kim Jong-chol

USAMGIK officers photographed the mass killings at Daejon city in central South Korea, where the Truth Commission believe some 3,000 to 7,000 people were shot and buried in mass graves in early July 1950. Other declassified records report that a US Army lieutenant colonel approved the assassination of 3,500 political prisoners by the ROK Army unit to which he was military advisor when the KPA reached the southern port city of Pusan. US diplomats reported having urged the Rhee régime's restraint against its political opponents, and that the USAMGIK, who formally controlled the peninsular south, did not halt the mass assassinations.

Prisoners of war

See also: Korean POWs detained in North Korea and Hill 303 massacre

An executed U.S. Army POW of the U.S. 21st Infantry Regiment killed 9 July 1950. Picture taken 10 July 1950

The US reported that North Korea mistreated prisoners of war: soldiers were beaten, starved, put to forced labor, marched to death, and summarily executed.

The KPA killed POWs at the battles for Hill 312, Hill 303, the Pusan Perimeter, and Daejeon—discovered during early after-battle mop-up actions by the UN forces. Later, a US Congress war crimes investigation, the United States Senate Subcommittee on Korean War Atrocities of the Permanent Subcommittee of the Investigations of the Committee on Government Operations reported that "... two-thirds of all American prisoners of war in Korea died as a result of war crimes".

Although the Chinese rarely execute prisoners like their Korean counterpart, mass starvation and diseases swept through the Chinese POW camps during the winter of 1950-51. About 43 percent of all US POWs died during this period. In comparison, only 34 percent of all US prisoners died under Japanese captivity during the World War II. The Chinese defended their actions by stating that all Chinese soldiers during this period were also suffering mass starvation and diseases due to the lack of competent logistics system. The UN POWs, however, disputed the claim by pointing out that most of the Chinese camps were located near the Sino-Korean border, and that starvation was used to force the prisoners to accept the communism indoctrinations programs, which were running in full swing after the starvation were over.

The North Korean Government reported some 70,000 ROK Army POWs; 8,000 were repatriated. South Korea repatriated 76,000 Korean People's Army POWs. Besides the 12,000 UN Command forces POWs dead in captivity, the KPA might have press-ganged some 50,000 ROK POWs into the North Korean military. Per the South Korean Ministry of Defense, there remained some 560 Korean POWs detained in North Korea in 2008; from 1994 until 2003, some 30 ROK POWs escaped the North.

The North Korean Government denied having POWs from the Korean War, and, via the Korean Central News Agency, reported that the UN forces killed some 33,600 KPA POWs; that on 19 July 1951, in POW Camp No. 62, some 100 POWs were killed as machine-gunnery targets; that on 27 May 1952, in the 77th Camp, Koje Island, the ROK Army incinerated with flamethrowers some 800 KPA POWs who rejected "voluntary repatriation" south, and instead demanded repatriation north.

Starvation

See also: National Defense Corps Incident

In the winter of 1951, 50,000 to 90,000 South Korean National Defense Corps soldiers starved to death while marching southward under the Chinese offensive when their commanding officers embezzled funds earmarked for their food. This event is called the National Defense Corps Incident.

Legacy

Main article: Legacy of the Korean War

The DMZ as seen from the north, 2005.

A U.S. Army Captain confers with ROK Army counterparts, at Observation Post (OP) Ouellette, viewing northward, April 2008.

The Korean War (1950–53) was the first major proxy war in the Cold War (1945–91), the prototype of the following sphere-of-influence wars such as the Vietnam War (1959–75). The Korean War established proxy war as one way that the nuclear superpowers indirectly conducted their rivalry in third-party countries. The NSC-68 Containment Policy extended the cold war from occupied Europe to the rest of the world.

Fighting ended at the 38th parallel and the Korean Demilitarized Zone, a strip of land 248x4 km (155x2.5 mi), now divides the two countries. Even so, skirmishes, incursions, and incidents between the combatants have continued since the Armistice was signed.

The Korean War affected other participant combatants. Turkey, for example, entered NATO in 1952.

Post-war recovery was different in the two Koreas. South Korea stagnated in the first post-war decade, but later industrialized and modernized. Contemporary North Korea remains underdeveloped. The economy of South Korea is a modern free market economy, and South Korea is a member of the Organisation for Economic Co-operation and Development (OECD) and G-20 groups. In the 1990s North Korea faced significant economic disruptions. The North Korean famine is believed to have killed as many as 2.5 million people. The CIA World Factbook estimates North Korea's GDP (Purchasing power parity (PPP)) is $40 billion, which is 3.0% of South Korea's $1.196 trillion GDP (PPP). North Korean personal income is $1,800 per capita, which is 7.0% of the South Korean $24,500 per capita income.

Anti-communism remains in ROK politics. The Uri Party practiced a "Sunshine Policy" towards North Korea; the US often disagreed with the Uri Party and (former) ROK President Roh about relations between the Koreas. The conservative Grand National Party (GNP), the Uri Party's principal opponent, is anti-North Korea.

Depictions

Main article: Korean War in contemporary culture

The Korean War has been the subject of films and books, and has been depicted in other media such as theatre and photography. The TV series M*A*S*H is one well known example. The 1959 novel The Manchurian Candidate has twice been made into films. The 1982 film Inchon depicted the invasion at Inchon. Many films about the war have been produced in Asian countries as well.

See also

• Cold War
• Joint Advisory Commission, Korea
• Korean reunification
• List of Korean War weapons
• List of wars and disasters by death toll
• List of wars extended by diplomatic irregularity
• M*A*S*H
• Military history of Australia during the Korean War
• Pyongyang Sally
• Second Korean War
• UNCMAC—the UN Command Military Armistice Commission operating from 1953 to the present
• UNCURK—the 1951 UN Commission for the Unification and Rehabilitation of Korea
• UNTCOK—the 1950 United Nations Temporary Commission on Korea
• Vietnam War

References

• Brune, Lester and Robin Higham, eds., The Korean War: Handbook of the Literature and Research (Greenwood Press, 1994)
• Edwards, Paul M. Korean War Almanac (2006)
• Foot, Rosemary, "Making Known the Unknown War: Policy Analysis of the Korean Conflict in the Last Decade," Diplomatic History 15 (Summer 1991): 411–31, in JSTOR
• Goulden, Joseph C., Korea: The Untold Story of the War, New York: McGraw-Hill Book Company, 1982.
• Heo, Man-ho, "North Korea's Continued Detention of South Korean POWs since the Korean and Vietnam Wars" Korea Journal of Defense Analysis (2002) Vol. XIV No. 2; pp. 141–165; http://kida.re.kr/eng/publication/pdf/08-Heo.PDF
• Hickey, Michael, The Korean War: The West Confronts Communism, 1950–1953 (London: John Murray, 1999) ISBN 0-7195-5559-0 9780719555596
• Ho, Kang, Pak (Pyongyang 1993). "The US Imperialists Started the Korean War". Foreign Languages Publishing House. {{cite news}}: Check date values in: |date= (help)CS1 maint: multiple names: authors list (link)
• Kaufman, Burton I. The Korean Conflict (Greenwood Press, 1999).
• Knightley, P. The First Casualty: The War Correspondent as Hero, Propagandist and Myth-maker (Quartet, 1982)
• Korea Institute of Military History, The Korean War (1998) (English edition 2001), 3 vol, 2600 pp; highly detailed history from South Korean perspective, U of Nebraska Press. ISBN 0-8032-7802-0
• Leitich, Keith. Shapers of the Great Debate on the Korean War: A Biographical Dictionary (2006) covers Americans only
• James I. Matray, ed., Historical Dictionary of the Korean War (Greenwood Press, 1991)
• Masatake, Terauchi (1910-08-27). "Treaty of Annexation". USC-UCLA Joint East Asian Studies Center. Retrieved 2007-01-16.
• Millett, Allan R, "A Reader's Guide To The Korean War" Journal of Military History (1997) Vol. 61 No. 3; p. 583+ full text in JSTOR; free online revised version
• Millett, Allan R. "The Korean War: A 50 Year Critical Historiography," Journal of Strategic Studies 24 (March 2001), pp. 188–224. full text in Ingenta and Ebsco; discusses major works by British, American, Korean, Chinese, and Russian authors
• Sandler, Stanley ed., The Korean War: An Encyclopedia (Garland, 1995)
• Summers, Harry G. Korean War Almanac (1990)
• Werrell, Kenneth P. (2005). Sabres over MiG alley. Annapolis: Naval Institute Press. ISBN 9781591149330. Retrieved 2009-07-19.

Further reading

Victims of a massacre with their hands bound in burial area near Waegwan, Korea.

Combat studies, soldiers

• Appleman, Roy E. South to the Naktong, North to the Yalu (1961), Official US Army history covers the Eighth Army and X Corps from June to November 1950
• Appleman, Roy E.. East of Chosin: Entrapment and Breakout in Korea (1987); Escaping the Trap: The US Army in Northeast Korea, 1950 (1987); Disaster in Korea: The Chinese Confront MacArthur (1989); Ridgway Duels for Korea (1990).
• Blair, Clay. The Forgotten War: America in Korea, 1950–1953 (1987), revisionist study that attacks senior American officials
• Field Jr., James A. History of United States Naval Operations: Korea, University Press of the Pacific, 2001, ISBN 0-89875-675-8. official US Navy history
• Farrar-Hockley, General Sir Anthony. The British Part in the Korean War, HMSO, 1995, hardcover 528 pages, ISBN 0-11-630962-8
• Futrell, Robert F. The United States Air Force in Korea, 1950–1953, rev. ed. (Office of the Chief of Air Force History, 1983), official US Air Force history
• Halberstam, David. The Coldest Winter: America and the Korean War, Hyperion, 2007, ISBN 1-4013-0052-9.
• Hallion, Richard P. The Naval Air War in Korea (1986).
• Hamburger, Kenneth E. Leadership in the Crucible: The Korean War Battles of Twin Tunnels and Chipyong-Ni. Texas A. & M. U. Press, 2003. 257 pp.
• Hastings, Max. The Korean War (1987). British perspective
• James, D. Clayton The Years of MacArthur: Triumph and Disaster, 1945–1964 (1985), scholarly biography of MacArthur
• James, D. Clayton with Anne Sharp Wells, Refighting the Last War: Command and Crises in Korea, 1950–1953 (1993)
• Johnston, William. A War of Patrols: Canadian Army Operations in Korea. U. of British Columbia Press, 2003. 426 pp.
• Kindsvatter, Peter S. American Soldiers: Ground Combat in the World Wars, Korea, and Vietnam. U. Press of Kansas, 2003. 472 pp.
• Millett, Allan R. Their War for Korea: American, Asian, and European Combatants and Civilians, 1945–1953. Brassey's, 2003. 310 pp.
• Millett, Allan R. The War For Korea, 1950–1951: They Came From the North (University Press of Kansas; 2010) 644 pages
• Montross, Lynn et al., History of US Marine Operations in Korea, 1950–1953, 5 vols. (Washington: Historical Branch, G-3, Headquarters, Marine Corps, 1954–72),
• Mossman, Billy. Ebb and Flow (1990), Official US Army history covers November 1950 to July 1951.
• Russ, Martin. Breakout: The Chosin Reservoir Campaign, Korea 1950, Penguin, 2000, 464 pages, ISBN 0-14-029259-4
• Toland, John. In Mortal Combat: Korea, 1950–1953 (1991)
• Varhola, Michael J. Fire and Ice: The Korean War, 1950–1953 (2000)
• Watson, Brent Byron. Far Eastern Tour: The Canadian Infantry in Korea, 1950–1953. 2002. 256 pp.

Origins, politics, diplomacy

• Chen Jian, China's Road to the Korean War: The Making of the Sino-American Confrontation (Columbia University Press, 1994).
• Cumings, Bruce. Origins of the Korean War (two volumes), Princeton University Press, 1981, 1990.
• Goncharov, Sergei N., John W. Lewis; and Xue Litai, Uncertain Partners: Stalin, Mao, and the Korean War, Stanford University Press, 1993, ISBN 0-8047-2521-7, diplomatic
• Kaufman, Burton I. The Korean War: Challenges in Crisis, Credibility, and Command. Temple University Press, 1986), focus is on Washington
• Matray, James. "Truman's Plan for Victory: National Self Determination and the Thirty-Eighth Parallel Decision in Korea," Journal of American History 66 (September, 1979), 314–33. in JSTOR
• Millett, Allan R. The War for Korea, 1945–1950: A House Burning vol 1 (2005)ISBN 0-7006-1393-5, origins
• Schnabel, James F (1972). United States Army in the Korean War: Policy and Direction: The First Year. United States Army Center of Military History. CMH Pub 20-1-1. {{cite book}}: Unknown parameter |city= ignored (|location= suggested) (help) – full text online
• Spanier, John W. The Truman-MacArthur Controversy and the Korean War (1959).
• Stueck, William. Rethinking the Korean War: A New Diplomatic and Strategic History. Princeton U. Press, 2002. 285 pp.
• Stueck, Jr., William J. The Korean War: An International History (Princeton University Press, 1995), diplomatic
• Zhang Shu-gang, Mao's Military Romanticism: China and the Korean War, 1950–1953 (University Press of Kansas, 1995)

Reference sources

• Edwards, Paul M. The A to Z of the Korean War. The Scarecrow Press, 2005. 307 pp.
• Edwards, Paul M. The Hill Wars of the Korean Conflict : A Dictionary of Hills, Outposts and other Sites of Military Action. McFarland & Co., 2006. 267 pp.
• Edwards, Paul M. The Korean War: a Historical Dictionary. The Scarecrow Press, 2003. 367 pp.
• Matray, James I. (ed.) Historical Dictionary of the Korean War. Greenwood Press, 1991. 626 pp.

Primary sources

• Bassett, Richard M. And the Wind Blew Cold: The Story of an American POW in North Korea. Kent State U. Press, 2002. 117 pp.
• Bin Yu and Xiaobing Li, eds. Mao's Generals Remember Korea, University Press of Kansas, 2001, hardcover 328 pages, ISBN 0-7006-1095-2
• S.L.A. Marshall, The River and the Gauntlet (1953) on combat
• Matthew B. Ridgway, The Korean War (1967).

External links

Historical

• The Cold War International History Project's Document Collection on the Korean War
• Korean War Documentary
• Calvin College on the Impact of the War on the Korean People
• Facts and texts on the War
• BBC: American Military Conduct in the Korean War
• Atrocities against Americans in the Korean War
• Atrocities by Americans in the Korean War
• Korean section of the West Point Atlas of American Wars
• POW films, brainwashing and the Korean War
• North Korea International Documentation Project
• Documents on the Korean Conflict at the Dwight D. Eisenhower Presidential Library
• Grand Valley State University Veteran's History Project digital collection
• The Forgotten War, Remembered – four testimonials by The New York Times
• Collection of Books and Research Materials on the Korean War an online collection of the United States Army Center of Military History

Media

• The Korean War You Never Knew & Life in the Korean War – slideshows by Life magazine
• QuickTime sequence of 27 maps adapted from the West Point Atlas of American Wars
• Animation for operations in 1950
• Animation for operations in 1951
• US Army Korea Media Center official Korean War online image archive
• Rare pictures of the Korean War from the U.S. Library of Congress and National Archives

Organizations

• Korea Defense Veterans of America
• Korean War Ex-POW Association
• Korean War Veterans Association
• The Center for the Study of the Korean War

Memorials

• Korean Children's War Memorial
• Pathé Online newsreel archive featuring films on the war
• CBC Digital Archives—Forgotten Heroes: Canada and the Korean War
• Chinese 50th Anniversary Korean War Memorial