Operation Ke (ケ号作戦) was the largely successful withdrawal of Japanese forces from Guadalcanal at the conclusion of the Guadalcanal Campaign of World War II. The operation took place between 14 January and 7 February 1943, and involved both army and navy forces under the overall direction of the Japanese Imperial General Headquarters (IGH). Commanders of the operation included Isoroku Yamamoto and Hitoshi Imamura.
The Japanese decided to withdraw and concede Guadalcanal to Allied forces for several reasons. All attempts by the Japanese army to recapture Henderson Field, the airfield on Guadalcanal in use by Allied aircraft, had been repulsed with heavy losses. Japanese ground forces on the island were beginning to die in large numbers from starvation and lack of adequate medical care. Japanese naval forces in the area were also suffering heavy losses attempting to reinforce and resupply the Japanese forces on the island. These losses, plus the projected resources needed for more attempts to recapture Guadalcanal, were affecting strategic security and operations in other areas of the Japanese Empire. The decision to withdraw was endorsed by Emperor Hirohito on 31 December 1942.
The operation began on 14 January with the delivery of a battalion of infantry troops to Guadalcanal to act as rearguard for the evacuation. Around the same time, Japanese army and navy air forces began an air superiority campaign around the Solomon Islands and New Guinea. During the air campaign, a U.S. cruiser was sunk in the Battle of Rennell Island. Two days later, Japanese aircraft sank a U.S. destroyer near Guadalcanal. The actual withdrawal was carried out on the nights of 1, 4, and 7 February by destroyers. Apart from some air and PT boat attacks on the evacuating destroyers, Allied forces did not actively attempt to impede the withdrawal because Allied commanders believed the operation was actually a reinforcement operation, not an evacuation.
In total, the Japanese evacuated 10,652 men from Guadalcanal at a cost of one destroyer sunk and three damaged. On 9 February, Allied forces realized that the Japanese were gone and declared Guadalcanal secure, ending the six-month campaign for control of the island.
Guadalcanal Campaign 
On 7 August 1942, Allied forces (primarily United States) landed on Guadalcanal, Tulagi, and Florida Islands in the Solomon Islands. The landings on the islands were meant to deny their use by the Japanese as bases for threatening the supply routes between the U.S. and Australia, and to secure the islands as starting points for a campaign with the eventual goal of capturing or neutralizing the major Japanese base at Rabaul while also supporting the Allied New Guinea campaign. The landings initiated the six-month-long Guadalcanal campaign.
The Japanese were surprised, and by nightfall on 8 August the Allied troops (mainly United States Marine Corps) secured Tulagi and nearby small islands as well as the Japanese airfield under construction at Lunga Point on Guadalcanal. The Allies later renamed it "Henderson Field". Allied aircraft operating out of Henderson were called the "Cactus Air Force" (CAF) after the Allied code name for Guadalcanal.
In response to the Allied landings on Guadalcanal, the Japanese Imperial General Headquarters (IGH) assigned the Imperial Japanese Army's (IJA) 17th Army, a corps-sized command headquartered at Rabaul under the command of Lieutenant General Harukichi Hyakutake, the task of retaking Guadalcanal. Because of the threat by CAF aircraft, the Imperial Japanese Navy (IJN) was unable to use large, slow transport ships to deliver troops and supplies to the island. Instead, warships based at Rabaul and the Shortland Islands were used to carry forces to Guadalcanal. The Japanese warships, mainly light cruisers and destroyers from the Eighth Fleet under the command of Vice Admiral Gunichi Mikawa, were usually able to make the round trip down "The Slot" to Guadalcanal and back in a single night, thereby minimizing their exposure to CAF air attack. These high speed warship runs to Guadalcanal occurred throughout the campaign and were later called the "Tokyo Express" by Allied forces and "Rat Transportation" by the Japanese.
Using forces delivered to Guadalcanal in this manner, the Japanese army tried three times to retake Henderson Field, but was defeated every time. After the third failure, an attempt by the IJN to deliver the rest of the IJA 38th Infantry Division and its heavy equipment failed during the Naval Battle of Guadalcanal from 12–15 November. Because of this failure, the Japanese cancelled their next planned attempt to recapture Henderson Field.
In mid-November, Allied forces attacked the Japanese at Buna-Gona in New Guinea. Japanese Combined Fleet naval leaders, headquartered at Truk and under the overall command of Admiral Isoroku Yamamoto, felt Allied advances in New Guinea posed a greater threat to the security of the Japanese Empire than an Allied military presence in the southern Solomons. Therefore, Combined Fleet naval staff officers began to prepare plans for abandoning Guadalcanal and shifting priorities and resources to operations around New Guinea. At this time, the navy did not inform the army of their intentions in this regard.
As December began, the Japanese experienced considerable difficulty in keeping their troops on Guadalcanal resupplied because of Allied air and naval attacks on the Japanese supply chain of ships and bases. The few supplies delivered to the island were not enough to sustain Japanese troops, who by 7 December were losing about 50 men each day from malnutrition, disease, and Allied ground or air attacks. The Japanese had delivered almost 30,000 army troops to Guadalcanal since the campaign began, but by December only about 20,000 of that number were still alive, and only about 12,000 remained more or less fit for combat duty, with the rest incapacitated by battle wounds, disease, or malnutrition.
The IJN continued to suffer losses and damage to its ships in attempting to keep the Japanese on Guadalcanal resupplied. One destroyer was sunk by American warships at the Battle of Tassafaronga on 30 November. Another destroyer plus a submarine were sunk and two destroyers damaged by American PT boat and CAF air attacks during subsequent resupply missions from 3–12 December. Compounding the navy's frustration, very few of the supplies carried on these missions actually reached Japanese army forces on the island. Combined Fleet leaders began telling their army counterparts the losses and damage to warships engaged in the resupply effort threatened future strategic plans for protecting the Japanese Empire.
Decision to withdraw 
Throughout November, Japan's top military leaders at the IGH in Tokyo continued to openly support further efforts to retake Guadalcanal from Allied forces. At the same time, however, lower-ranking staff officers began to discreetly discuss abandoning the island. Takushiro Hattori and Masanobu Tsuji, each of whom had recently visited Guadalcanal, told their colleagues on the staff that any further attempt to retake the island was a lost cause. Ryūzō Sejima reported that the attrition of IJA troop-strength on Guadalcanal was so unexpectedly severe that future operations would be untenable. On 11 December, two staff officers, IJN Commander Yuji Yamamoto and IJA Major Takahiko Hayashi returned to Tokyo from Rabaul and confirmed Hattori's, Tsuji's, and Sejima's reports. They further reported that most of the IJN and IJA officers at Rabaul appeared to support abandoning Guadalcanal. Around this time, Japan's War Ministry informed the IGH that there was an insufficient amount of shipping to support both the effort to retake Guadalcanal and transport strategic resources to maintain Japan's economy and military forces.
On 19 December, a delegation of IGH staff officers, led by IJA Colonel Joichiro Sanada, chief of the IGH's operations section, arrived at Rabaul for discussions about future plans concerning New Guinea and Guadalcanal. Hitoshi Imamura, commander of the 8th Area Army in charge of IJA operations in New Guinea and the Solomons, did not directly recommend a withdrawal from Guadalcanal but openly and clearly described the current difficulties involved with any further attempts to retake the island. Imamura also stated that any decision to withdraw should include plans to evacuate as many of the soldiers from Guadalcanal as possible.
Sanada returned to Tokyo on 25 December and recommended to the IGH that Guadalcanal be abandoned immediately and all priority given to the campaign in New Guinea. The IGH's top leaders agreed with Sanada's recommendation on 26 December and ordered their staffs to begin drafting plans for the withdrawal from Guadalcanal and establishment of a new defense line in the central Solomons.
On 28 December, General Hajime Sugiyama and Admiral Osami Nagano personally informed Emperor Hirohito of the decision to withdraw from Guadalcanal. On 31 December, the Emperor formally endorsed the decision.
Plan and forces 
On 3 January, IGH informed the 8th Area Army and the Combined Fleet of the decision to withdraw from Guadalcanal. By 9 January, the Combined Fleet and 8th Area Army staffs together completed the plan, officially called Operation Ke after a mora in Japanese Kana vocabulary, to execute the evacuation.
The plan called for a battalion of army infantry to land by destroyer on Guadalcanal around 14 January to act as a rear guard during the evacuation. The 17th Army was to begin withdrawing to the western end of the island about 25 or 26 January. An air superiority campaign around the southern Solomons would begin on 28 January. The 17th Army would be picked up in three lifts by destroyers the first week of February with a target completion date of 10 February. At the same time, Japanese air and naval assets would conduct conspicuous maneuvers and minor attacks around New Guinea and the Marshall Islands along with deceptive radio traffic to try to confuse the Allies as to the Japanese intentions.
Yamamoto detailed aircraft carriers Junyō and Zuiho, battleships Kongō and Haruna — with four heavy cruisers and a destroyer as the screening force — under Nobutake Kondō to provide distant cover for Ke around Ontong Java in the northern Solomons. The evacuation runs were to be carried out by Mikawa's 8th Fleet, consisting of heavy cruisers Chōkai and Kumano, light cruiser Sendai, and 21 destroyers. Mikawa's destroyers were charged with conducting the actual evacuation. Yamamoto expected that at least ½ of Mikawa's destroyers would be sunk during the operation.
Supporting the air superiority portion of the operation were the IJN's 11th Air Fleet and the IJA's 6th Air Division, based at Rabaul with 212 and 100 aircraft, respectively. In addition, 64 aircraft from carrier Zuikaku's air group were temporarily assigned to Rabaul. An additional 60 floatplanes from the IJN's "R" Area Air Force, based at Rabaul, Bougainville, and the Shortland Islands, brought the total number of Japanese aircraft involved in the operation to 436. The combined Japanese warship and naval air units in the area formed the Southeast Area Fleet, commanded by Jinichi Kusaka at Rabaul.
Opposing the Japanese and under the command of U.S. Navy Admiral William Halsey, Jr., commander of Allied forces in the South Pacific, were fleet carriers USS Enterprise and Saratoga, six escort carriers, three fast battleships, four old battleships, 13 cruisers, and 45 destroyers. In the air, the 13th Air Force numbered 92 fighters and bombers under U.S. Army Brigadier General Nathan F. Twining and the CAF on Guadalcanal counted 81 aircraft under US Marine Brigadier General Francis P. Mulcahy. Rear Admiral Aubrey Fitch was overall commander of Aircraft South Pacific. The air units of the fleet and escort carriers added another 339 aircraft. In addition, 30 heavy bombers were stationed in New Guinea with sufficient range to conduct missions over the Solomon Islands. In total, the Allies possessed around 539 aircraft available to oppose the Ke operation.
By the first week of January, disease, starvation, and battle had reduced Hyakutake's command to about 14,000 troops, with many of them too sick and malnourished to fight. The 17th Army possessed three operable field cannon and a severe shortage of artillery shells. In contrast, the Allied commander on the island, U.S. Army Major General Alexander Patch, fielded a combined force of U.S. Army and U.S. Marines, designated the XIV Corps, totaling 50,666 men. At Patch's disposal were 167 artillery weapons, including 75 mm (2.95 in), 105 mm (4.13 in), and 155 mm (6.1 in) howitzers, and plentiful stocks of shells.
On 1 January, the Japanese military changed their radio communication codes, making it more difficult for Allied intelligence, which had heretofore partially broken Japanese radio ciphers, to divine Japanese intentions and movement. As January progressed, Allied reconnaissance and radio traffic analysis noted the buildup of ships and aircraft at Truk, Rabaul, and the Shortland Islands. Allied analysts determined that the increased radio traffic in the Marshalls was a deception meant to divert attention from an operation about to take place in either New Guinea or the Solomons. Allied intelligence personnel, however, misinterpreted the nature of the operation. On 26 January, the Allied Pacific Command's intelligence section informed Allied forces in the Pacific that the Japanese were preparing for a new offensive, called Ke, in either the Solomons or New Guinea.
On 14 January, an Express mission of nine destroyers delivered the Yano Battalion, designated as the rear guard for the Ke evacuation, to Guadalcanal. The battalion, commanded by Major Keiji Yano, consisted of 750 infantry and a battery of mountain guns crewed by another 100 men. Accompanying the battalion was Lieutenant Colonel Kumao Imoto, representing the 8th Area Army, who was to deliver the evacuation order and plan to Hyakutake. The 17th Army had not yet been informed of the decision to withdraw. CAF and 13th Air Force air attacks on the nine destroyers during their return trip damaged destroyers Arashi and Tanikaze and destroyed eight Japanese fighters escorting the convoy. Five American aircraft were shot down.
|"It is a very difficult task for the army to withdraw under existing circumstances. However, the orders of the Area Army, based upon orders of the Emperor, must be carried out at any cost. I cannot guarantee it can be completely carried out."|
|Harukichi Hyakutake, 16 January 1943|
Late on 15 January, Imoto reached 17th Army's headquarters at Kokumbona and informed Hyakutake and his staff of the decision to withdraw from the island. Grudgingly accepting the order on the 16th, the 17th Army staff communicated the Ke evacuation plan to their forces on the 18th. The plan directed the 38th Division, which was currently defending against an American offensive on ridges and hills in the interior of the island, to disengage and withdraw towards Cape Esperance on the western end of Guadalcanal beginning on the 20th. The 38th's retirement would be covered by the 2nd Infantry Division, in place on Guadalcanal since October 1942, and the Yano Battalion, both of which would then follow the 38th westward. Any troops unable to move were encouraged to kill themselves to "uphold the honor of the Imperial Army".
Withdrawal westward 
Patch initiated a new offensive just as the 38th Division began to withdraw from the inland ridges and hills that it had occupied. On 20 January, the 25th Infantry Division, under Major General J. Lawton Collins, attacked several hills, designated Hills 87, 88, and 89 by the Americans, that formed a ridge that dominated Kokumbona. Encountering much lighter resistance than anticipated, the Americans seized the three hills by the morning of 22 January. Shifting forces to exploit the unexpected breakthrough, Collins quickly continued the advance and captured the next two hills, 90 and 91, by nightfall, placing the Americans in position to isolate and capture Kokumbona and trap the Japanese 2nd Division.
Reacting quickly to the situation, the Japanese hurriedly evacuated Kokumbona and ordered the 2nd Division to retire westward immediately. The Americans captured Kokumbona on 23 January. Although some Japanese units were trapped between the American forces and destroyed, most of the 2nd Division's survivors escaped.
Still fearing a renewed and reinforced Japanese offensive, Patch committed the equivalent of only one regiment at a time to attack the Japanese forces west of Kokumbona, keeping the rest near Lunga Point to protect the airfield. The terrain west of Kokumbona favored the Japanese efforts to delay the Americans as the rest of the 17th Army continued its withdrawal towards Cape Esperance. The American advance was hemmed into a corridor only 300–600 yd (270–550 m) wide between the ocean and the thick, inland jungle and steep coral ridges. The ridges, running perpendicular to the coast, paralleled numerous streams and creeks that crossed the corridor with "washboard regularity."
On 26 January, a combined U.S. Army and Marine unit called the Composite Army-Marine (CAM) Division advancing westward encountered the Yano Battalion at the Marmura River. Yano's troops temporarily halted the CAM's advance and then slowly withdrew westward over the next three days. On 29 January, the Yano retreated across the Bonegi River, where soldiers from the 2nd Division had constructed another defensive position.
The Japanese defenses at the Bonegi held up the American advance for almost three days. On 1 February, with help from a shore bombardment by the destroyers USS Wilson and Anderson, the Americans successfully crossed the river but did not immediately press the advance westward.
Air campaign 
The Ke air superiority campaign began in mid-January with nightly harassment attacks on Henderson Field by 3-10 aircraft, causing little damage. On 20 January, a lone Kawanishi H8K bombed Espiritu Santo. On 25 January, the IJN sent 58 Zero fighters on a daylight raid to Guadalcanal. In response, the CAF sent aloft eight Wildcat and six P-38 fighters, which shot down four Zeros without loss.
A second large raid was conducted on 27 January by nine Kawasaki Ki-48 "Lily" light bombers escorted by 74 Nakajima Ki-43 "Oscar" fighters from the IJA's 6th Air Division from Rabaul. Twelve Wildcats, six P-38s, and 10 P-40s from Henderson met the raid over Guadalcanal. In the resulting action, the Japanese lost six fighters while the CAF lost one Wildcat, four P-40s, and two P-38s. The "Lily"s dropped their bombs on American positions around the Matanikau River, causing little damage.
Battle of Rennell Island 
Believing that the Japanese were beginning a major offensive in the southern Solomons aimed at Henderson Field, Halsey responded by sending, beginning on 29 January, a resupply convoy to Guadalcanal supported by most of his warship forces, separated into five task forces. These five task forces included two fleet carriers, two escort carriers, three battleships, 12 cruisers, and 25 destroyers
Screening the approach of the transport convoy was Task Force 18 (TF 18), under Rear Admiral Robert C. Giffen, with three heavy and three light cruisers, two escort carriers, and eight destroyers. A fleet carrier task force, centered on carrier USS Enterprise, steamed about 250 mi (220 nmi; 400 km) behind TF 18.
In addition to protecting the supply convoy, TF 18 was charged with rendezvousing with a force of four U.S. destroyers, stationed at Tulagi, at 21:00 on 29 January in order to conduct a sweep up "The Slot" north of Guadalcanal the next day to screen the unloading of the transports at Guadalcanal. However, the escort carriers were too slow to allow Giffen's force to make the scheduled rendezvous, so Giffen left the carriers behind with two destroyers at 14:00 on 29 January and pushed on ahead.
Giffen's force was being tracked by Japanese submarines, who reported on Giffen's location and movement to their naval headquarters units. Around mid-afternoon, based on the submarine's reports, 16 Mitsubishi G4M "Betty" from the 705 Air Group and 16 Mitsubishi G3M "Nell" bombers from the 701 Air Group took off from Rabaul carrying torpedoes to attack Giffen's force, now located between Rennell Island and Guadalcanal.
The torpedo bombers attacked Giffen's ships in two waves between 19:00 and 20:00. Two torpedoes hit the heavy cruiser USS Chicago, causing heavy damage and bringing her to a dead stop. Three of the Japanese aircraft were shot down by anti-aircraft fire from Giffen's ships. In response, Halsey sent a tug to take Chicago under tow and ordered Giffen's task force to return to base the next day. Six destroyers were left behind to escort Chicago and the tugboat.
At 16:00 on 30 January, a flight of 11 Mitsubishi torpedo bombers from the 751 Air Group, based at Kavieng and staging through Buka, attacked the force towing Chicago. Fighter aircraft from Enterprise shot down eight of them, but most of the Japanese aircraft were able to release their torpedoes before crashing. One torpedo hit the destroyer USS La Vallette, causing heavy damage. Four more torpedoes hit Chicago, sinking her.
The transport convoy reached Guadalcanal and successfully unloaded its cargo on 30–31 January. The rest of Halsey's warships took station in the Coral Sea south of the Solomons to wait for the approach of any Japanese warship forces supporting what the Allies believed to be an imminent offensive. The departure of TF 18 from the Guadalcanal area removed a significant potential threat to the Ke operation.
At 18:30 on 29 January, two corvettes from the Royal New Zealand Navy, Moa and Kiwi, intercepted the Japanese submarine I-1, which was attempting a supply run, off of Kamimbo on Guadalcanal. The two corvettes rammed and sank I-1 after a 90-minute battle (Coordinates: ).
First evacuation run 
Leaving his cruisers at Kavieng, Mikawa gathered all 21 of his destroyers at the Japanese naval base in the Shortlands on 31 January to begin the evacuation runs. Rear Admiral Shintaro Hashimoto was placed in charge of this group of destroyers, titled the Reinforcement Unit. The "R" Area Air Force's 60 floatplanes were tasked with scouting for the Reinforcement Unit and helping defend against Allied PT boat attacks during the nighttime evacuation runs. Allied B-17 bombers attacked the Shortlands anchorage on the morning of 1 February, causing no damage and losing four aircraft to Japanese fighters. This same day, the IJA's 6th Air Division raided Henderson Field with 23 "Oscar"s and six "Lily"s but caused no damage and suffered the loss of one fighter.
Believing that the Japanese might be retreating to the south coast of Guadalcanal, on the morning of 1 February Patch landed a reinforced battalion of army and Marine troops, about 1,500 men under the command of Colonel Alexander George, at Verahue on Guadalcanal's south coast. The U.S. troops were delivered to the landing location by a naval transport force of six landing craft tanks and one transport destroyer (USS Stringham), escorted by four other destroyers (the same destroyers that were to have joined TF 18 three days earlier). A Japanese reconnaissance aircraft spotted the naval landing force. Believing that the force posed a threat to that night's scheduled evacuation run, an airstrike of 13 Aichi D3A2 "Val" dive bombers escorted by 40 Zeros departed Buin, Bougainville to attack the ships.
Mistaking the Japanese strike aircraft as friendly, the U.S. destroyers withheld fire until the "Val"s began their attack. Beginning at 14:53, destroyer USS De Haven was rapidly hit by three bombs and sank almost immediately 2 mi (1.7 nmi; 3.2 km) south of Savo Island with the loss of 167 of her crew, including her captain. Destroyer USS Nicholas was damaged by several near-misses. Five "Val"s and three Zeros were lost to anti-aircraft fire and CAF fighters. The CAF lost three Wildcats in the engagement.
Hashimoto departed the Shortlands at 11:30 on 1 February with 20 destroyers for the first evacuation run. Eleven destroyers were designated as transports screened by the other nine. The destroyers were attacked in the late afternoon near Vangunu by 92 CAF aircraft in two waves. The Allied fliers scored a near miss on Makinami, Hashimoto's flagship, heavily damaging it. Four CAF aircraft were shot down. Hashimoto transferred to Shirayuki and detached Fumizuki to tow Makinami back to base.
Eleven U.S. PT boats awaited Hashimoto's destroyers between Guadalcanal and Savo Island. Beginning at 22:45, Hashimoto's warships and the PT boats engaged in a series of running battles over the next three hours. Hashimoto's destroyers, with help from "R" Area aircraft, sank three of the PT boats.
In the meantime, the transport destroyers arrived off of two pick-up locations at Cape Esperance and Kamimbo at 22:40 and 24:00 respectively. Japanese naval personnel ferried the waiting troops out to the destroyers in barges and landing craft. Rear Admiral Tomiji Koyanagi, second-in-command of the Reinforcement Unit, described the evacuees: "They wore only the remains of clothes that were so soiled their physical deterioration was extreme. Probably they were happy but they showed no expression. Their digestive organs were so completely destroyed, we couldn't give them good food, only porridge." Another officer added that, "Their buttocks were so emaciated that their anuses were completely exposed, and on the destroyers that picked them up they suffered from constant and uncontrolled diarrhea."
After embarking 4,935 soldiers, mainly from the 38th Division, the transport destroyers ceased loading at 01:58 and prepared to depart for the return trip to the Shortlands. About this time, Makigumo, one of the screening destroyers, was suddenly wracked by a large explosion, caused by either a PT boat torpedo or a naval mine. Informed that Makigumo was immobilized, Hashimoto ordered her abandoned and scuttled ( ). During the return trip, the Reinforcement Unit was attacked by CAF aircraft at 08:00, but sustained no damage and arrived at the Shortlands without further incident at 12:00 on 2 February.
Second and third evacuation runs 
On 4 February, Patch ordered the 161st Infantry Regiment to replace the 147th at the front and resume the advance westward. The Yano battalion retreated to new positions at the Segilau River and troops were sent to block the advance of George's force along the south coast. Meanwhile, Halsey's carrier and battleship task forces remained just beyond Japanese air attack range about 300 mi (260 nmi; 480 km) south of Guadalcanal.
Kondo sent two of his force's destroyers, Asagumo and Samidare, to the Shortlands to replace the two destroyers lost in the first evacuation run. Hashimoto led the second evacuation mission with 20 destroyers south toward Guadalcanal at 11:30 on 4 February. The CAF attacked Hashimoto in two waves beginning at 15:50 with a total of 74 aircraft. Bomb near-misses heavily damaged Maikaze, and Hashimoto detached Nagatsuki to tow her back to Shortland. The CAF lost 11 aircraft in the attack while the Japanese lost one Zero.
The U.S. PT boats did not sortie to attack Hashimoto's force this night and the loading went uneventfully. The Reinforcement Force embarked Hyakutake, his staff, and 3,921 men, mainly from the 2nd Division, and reached Bougainville without incident by 12:50 on 5 February. A CAF airstrike launched that morning failed to locate Hashimoto's force.
Believing that the Japanese operations on 1 and 4 February had been reinforcement, not evacuation missions, the American forces on Guadalcanal proceeded slowly and cautiously, advancing only about 900 yd (820 m) each day. George's force halted on 6 February after advancing to Titi on the south coast. On the north coast, the 161st finally began their attack westward at 10:00 on 6 February and reached the Umasani River the same day. At the same time, the Japanese were withdrawing their remaining 2,000 troops to Kamimbo.
On 7 February, the 161st crossed the Umasani and reached Bunina, about 9 mi (7.8 nmi; 14 km) from Cape Esperance. George's force, now commanded by George F. Ferry, advanced from Titi to Marovovo and dug in for the night about 2,000 yd (1,800 m) north of the village.
Aware of the presence of Halsey's carriers and other large warships near Guadalcanal, the Japanese considered canceling the third evacuation run, but decided to go ahead as planned. Kondo's force closed to within 550 mi (480 nmi; 890 km) of Guadalcanal from the north to be ready in case Halsey's warships attempted to intervene. Hashimoto departed the Shortlands with 18 destroyers midday of 7 February, this time taking a course south of the Solomons instead of down the Slot. A CAF strike force of 36 aircraft attacked Hashimoto at 17:55, heavily damaging Isokaze with a bomb near miss. Isokaze retired escorted by Kawakaze. The Allies and the Japanese each lost one aircraft in the attack.
Arriving off Kamimbo, Hashimoto's force loaded 1,972 soldiers by 00:03 on 8 February, unhindered by the U.S. Navy. For an additional 90 minutes, destroyer crewmen rowed their boats along the shore calling out again and again to make sure no one was left behind. At 01:32, the Reinforcement Group left Guadalcanal in its wake and reached Bougainville without incident at 10:00, completing the operation.
At dawn on 8 February, the U.S. Army forces on both coasts resumed their advances, encountering only a few sick and dying Japanese soldiers. Patch now realized that the Tokyo Express runs over the last week were evacuation, not reinforcement missions. At 16:50 on 9 February, the two American forces met on the west coast at the village of Tenaro. Patch sent a message to Halsey stating, "Total and complete defeat of Japanese forces on Guadalcanal effected 16:25 today...the Tokyo Express no longer has a terminus on Guadalcanal."
The Japanese had successfully evacuated a total of 10,652 men from Guadalcanal, about all that remained of the 36,000 total troops sent to the island during the campaign. Six hundred of the evacuees succumbed to their injuries or illnesses before they could receive sufficient medical care. Three thousand more required lengthy hospitalization or recuperation. After receiving word of the completion of the operation, Yamamoto commended all the units involved and ordered Kondo to return to Truk with his warships. The 2nd and 38th Divisions were shipped to Rabaul and partially reconstituted with replacements. The 2nd Division was relocated to the Philippines in March 1943 while the 38th was assigned to defend Rabaul and New Ireland. The 8th Area Army and Southeast Area Fleet reoriented their forces to defend the central Solomons at Kolombangara and New Georgia and prepared to send the reinforcements, mainly consisting of the 51st Infantry Division, originally detailed for Guadalcanal to New Guinea. The 17th Army was rebuilt around the 6th Infantry Division and headquartered on Bougainville. A few Japanese stragglers remained on Guadalcanal, many of whom were subsequently killed or captured by Allied patrols. The last known Japanese holdout surrendered in October 1947.
In hindsight, historians have faulted the Americans, especially Patch and Halsey, for not taking advantage of their ground, aerial, and naval superiority to prevent the successful Japanese evacuation of most of their surviving forces from Guadalcanal. Said Chester Nimitz, commander of Allied forces in the Pacific, of the success of Operation Ke, "Until the last moment it appeared that the Japanese were attempting a major reinforcement effort. Only the skill in keeping their plans disguised and bold celerity in carrying them out enabled the Japanese to withdraw the remnants of the Guadalcanal garrison. Not until all organized forces had been evacuated on 8 February did we realize the purpose of their air and naval dispositions."
Nevertheless, the successful campaign to recapture Guadalcanal from the Japanese was an important strategic victory for the U.S. and its allies. Building on their success at Guadalcanal and elsewhere, the Allies continued their campaign against Japan, ultimately culminating in Japan's defeat and the end of World War II.
- Frank, p. 595–596.
- Zimmerman, p. 164, Frank, p. 595–596.
- Hogue, Pearl Harbor to Guadalcanal, p. 235–236.
- Morison, p. 14–15, Miller, p. 143; Frank, p.338; Shaw, p.18.
- Griffith, pp.96–99; Dull, p.225; Miller, pp.137–138.
- Frank, p. 202, 210–211, Morison, p. 81, 113–114.
- Frank, p. 141–158, 218–246, 337–367.
- Frank, p. 428–492, Morison, p. 286–287.
- Frank, p. 499.
- Frank, pp. 493–527; Hough, pp. 364–365; Morison, pp. 324–325. The malaria rate among Japanese troops on Guadalcanal at this time was near 100% and some may have even engaged in cannibalism because of the lack of food.
- Frank, pp. 513–524; Morison, pp. 318–321; Griffith, p. 268; Toland, p.424.
- Hayashi, p. 62, Griffith, p. 268, Frank, p. 534–536, Toland, p. 421–423.
- Griffith, p. 268, Frank, p. 536–538, Jersey, p. 384, Hayashi, p. 62. The 8th Area Army commanded the 17th Army on Guadalcanal and the 18th Army in New Guinea (Miller, p. 337). Sejima was included in the delegation to Rabaul.
- Jersey, p. 384, Frank, p. 538, Griffith, p. 268, Hayashi, p. 62–64, Toland, p. 426.
- Hayashi, p. 62–64, Griffith, p. 268, Frank, p. 539, Toland, p. 426. During the conference with Sugiyama and Nagano, the Emperor asked Nagano, "Why was it that it took the Americans just a few days to build an air base and the Japanese more than a month or so?" (The IJN originally occupied Guadalcanal and began constructing the airfield). Nagano apologized and replied that the Americans had used machines while the Japanese had to rely on manpower. (Toland, p. 426.)
- Miller, p. 338, Frank, p. 540–541, Morison, p. 333–334, Rottman, p. 64, Griffith, p. 269, Jersey, p. 384, Hayashi, p. 64. Imamura and Jinichi Kusaka, IJN commander at Rabaul, at first objected to the withdrawal order but accepted it on being reminded that it had the Emperor's endorsement.
- Frank, p. 541, Morison, p. 340.
- Frank, p. 542, 547–550, Morison, p. 338, 363, Rottman, p. 64, Griffith, p. 278, Jersey, p. 392–393. The 21 destroyers do not include Suzukaze and Hatsukaze which were damaged on Tokyo Express runs to Guadalcanal on 2 and 10 January. Suzukaze was damaged in the Slot by a near miss from a bomb dropped by a CAF aircraft. Hatsukaze was damaged by a PT boat torpedo between Doma Cove and Tassafaronga at Guadalcanal. Both Express missions together were able to successfully deliver about 80 tons of supplies, a significant boost for the 17th Army's depleted stores. Kondo's force consisted of carriers Zuiho and Junyō, battleships Kongo and Haruna, heavy cruisers Atago, Takao, Myoko, and Haguro, light cruisers Jintsu, Agano, and Nagara, destroyers Kagero, Asagumo, Shigure, Suzukaze, Samidare, Oshio, Hatsuyuki, Shikinami, Arashio, and Arashi, and support ships Nippon Maru and Ken'yō Maru.
- Frank, p. 543.
- Frank, p. 542–543. The four old battleships in Halsey's fleet were Maryland, Colorado, New Mexico and Mississippi (Frank, p. 751). Fifty-five B-17 and 60 B-24 heavy bombers with the range to reach Guadalcanal were assigned to the 5th Air Force in New Guinea, but only about 30 of them were operational at any one time (Frank, p. 752).
- Frank, p. 543–544, Rottman, p. 64. American artillery totals do not include anti-aircraft or coastal defense guns (Frank, p. 752). At this time, the Japanese 2nd Division was down to 3,700 still alive of the original 12,000 delivered to Guadalcanal.
- Frank, p. 545–546, Morison, p. 340, 351, D'Albas, p. 237.
- Griffith, p. 279, Frank, p. 559–560, Morison, p. 339, Rottman, p. 64, Jersey, p. 386–388, Toland, p. 427. The men of the Yano Battalion were drawn from personnel originally intended as replacements for the 38th Infantry Division's 230th Infantry Regiment already on Guadalcanal. Most of them were untrained reservists with an average age of 30. Also delivered on this mission were 150 communications specialist from the 8th Area Army to help coordinate the operation The first strike on the Express convoy on 15 January was by 15 CAF SBDs escorted by seven F4F Wildcats and six P-39 Airacobras. Two SBDs, one Wildcat, and two P-39s were downed along with three Zeros from the IJA's 6th Air Division (Frank, p. 754). The second, later airstrike consisted of nine B-17s, presumably from the 13th Air Force, and 14 fighters, presumably from the CAF, suffered no losses and shot down five of ten F1M2 "Pete" aircraft from the "R" Area Air Force that were protecting the convoy. Arashi was forced to go to Truk for repairs. Tanikaze's captain, Commander Motoi Katsumi, was killed by the air attack (Nevitt, CombinedFleet.com).
- Frank, p. 561.
- Frank, p. 541, 560–562, Miller, p. 349, Jersey, p. 368, 388–389, Griffith, p. 279–284, Rottman, p. 64, Toland, p. 428–429. Marching to Kokumbona, Imoto later related that he passed numerous, unburied bodies and sick and emaciated Japanese soldiers. At first upon hearing the order to withdraw, Hyakutake, his chief of staff, Major General Shuichi Miyazaki, and senior staff officer Colonel Norio Konuma contemplated disobeying the order and sacrificing the 17th Army in a final attack on Allied forces. Hyakutake finally accepted the order at noon on 16 January. The delay in informing the 17th's subordinate units apparently was in part because Konuma had to carry the orders on foot, first to the 38th Division, then to the 2nd Division.
- Hough, p. 367–368, Frank, p. 568-570, Miller, p. 319–329, Morison, p. 342–343. In the offensive, the 2nd Marine Division pressed the Japanese 2nd Division on the coast as the U.S. 25th Division, using two of its three regiments, the 27th and 161st, attacked inland. The 161st was originally tasked with capturing three nearby hills, Hills X, Y, and Z, but was retasked to support the 27th after the latter captured Hill 87 much more quickly than anticipated.
- Frank, p. 570, Miller, p. 329–332, Morison, p. 343. Morison says about 600 Japanese troops were killed in the taking of Kokumbona.
- Griffith, p. 284–285, Frank, p. 570–572, Hough, p. 369–371, Miller, p. 340.
- Jersey, p. 373, 375–376 Frank, p. 572, Morison, p. 343, Griffith, p 285, Hough, p. 369–371, Miller, p. 341, Shaw, p. 50–51. At this time, the CAM consisted of units from the 6th Marine Regiment and US Army's 147th Infantry Regiment. According to Jersey, also defending the Bonegi were troops from the 229th Regiment.
- Frank, p. 572, Morison, p. 343–344, Jersey, p. 373–374, 381, Miller, p. 341–342. Between 10 and 31 January the Americans lost 189 soldiers and Marines killed. Exact Japanese casualties in the Marmura and Bonegi River actions are unknown but Japanese records described their losses as "heavy". During this time, the Americans captured 105 Japanese soldiers, 240 machine guns, 42 field pieces, 10 antiaircraft guns, 9 antitank guns, 142 mortars, 323 rifles, 18 radios, 1 radar, 13 trucks, 6 tractors, and 1 staff car, besides a quantity of ammunition, land mines, flame throwers, and piles of documents (Miller p. 342).
- Frank, p. 573–574, 756, Morison, p. 340, 347. In addition to the four Zeros destroyed, six or more Zeros were damaged. One Mitsubishi G4M bomber sent along as a decoy failed to return. Two G4M's were lost during the night harassment campaign. A Zero was lost in a 20 January raid on Port Moresby. Chester Nimitz and Secretary of the Navy Frank Knox visited Espiritu Santo on 20 January and Guadalcanal on 21 January but were uninjured by the bombing attacks.
- Frank, p. 574, 756, Morison, p. 347–348. The leader of the raid was Lieutenant Colonel Shuichi Okamoto. Two Mitsubishi Ki-46 "Dinah"s from the 76th Independent Chutai also accompanied the raid. The "Lily"s were from the 45th Sentai. Thirty-six of the "Oscar"s were from the 1st Sentai, 33 from the 11th Sentai, and five were from the Headquarters of the 12th Air Wing.
- Morison, p. 351–352, Frank, p. 577. The supply convoy consisted of four transports escorted by four destroyers and was designated Task Group (TG) 62.8.
- Frank, p. 577–578, Crenshaw, p. 62, Morison, p. 352–353.
- Frank, p. 578.
- Morison, p. 354.
- Morison, p. 354, Tagaya, p. 66 says that it was a Japanese search airplane that spotted Giffen.
- Morison, p. 354–355, Tagaya, p. 66.
- Crenshaw, p. 62–63, Morison, p. 355–359, Frank, p. 579–580.
- Morison, p. 360–363, Frank, p. 580–581, Crenshaw, p. 64–65, Tagaya, pp. 66–67. One other Mitsubishi G4M on a scouting mission was shot down by Enterprise aircraft just before the final attack on Chicago.
- Morison, p. 363, Griffith, p 285. After unloading their cargo, the transports evacuated the 2nd Marine Regiment from the island. The 2nd Marines had been on Guadalcanal since the beginning of the campaign.
- Frank, p. 574–576, Hackett and Kingsepp HIJMS Submarine I-1 : Tabular Record of Movement, Morison, p. 348–350, Jersey, p. 372. Moa and Kiwi were based at Tulagi along with two other New Zealand corvettes- Matai and Tui. Moa was under the command of (then) Lieutenant Commander Peter Phipps. I-1 was under the command of Lieutenant Commander Eiichi Sakamoto. Sixty-six of the submarine's crew survived to reach shore, but Sakamoto was killed along with 26 others of his crew. The submarine's gunnery officer, Ensign Ko Oikawa, was captured by Moa. I-1 sank in shallow water, leaving about 15 feet (4.6 m) of the sub sticking out of the water at a 45° angle. On the night of 2 February, three of the sub's survivors along with 11 other IJN personnel present on Guadalcanal unsuccessfully attempted to destroy the wrecked sub. On 10 February, a raid by nine Aichi D3A divebombers escorted by 28 Zeros from the 582nd Naval Air Group at Buin struck the wreck, damaging it further but failing to destroy it. On 13 and 15 February, Japanese submarine I-2 attempted unsuccessfully to locate the wreck and complete its destruction. Allied divers later recovered five code books from the submarine, including one for a version of the JN-25 code. Assuming that the code had been compromised, the IJN upgraded three major naval codes. (Hackett and Kingsepp)
- Frank, p. 582–583, 757–758. The Reinforcement Unit included Destroyer Squadron 10 (DesRon10). DesRon10 was normally under the command of Rear Admiral Susumu Kimura, but Kimura was injured when the U.S. submarine Nautilus damaged his flagship Akizuki with a torpedo near Shortland on 19 January (Nevitt, IJN Akizuki: Tabular Record of Movement). Kimura was replaced by Rear Admiral Tomiji Koyanagi who was also designated as commander of the Reinforcement Unit, but for the Ke operation Hashimoto was selected to command the unit. On the night of 28 January, six of the Reinforcement Unit's destroyers, Tokitsukaze, Kuroshio, Shirayuki, Urakaze, Hamakaze, and Kawakaze, had landed 328 men in the Russell Islands in case the islands were needed as a staging and support area for the evacuation. A CAF attack on these men injured 17 of them. The "R" Area Air Force on 1 February consisted of 12 Aichi E13A, 12 Nakajima A6M2-N, and 36 Mitsubishi F1M aircraft operating from the seaplane tenders Kamikawa Maru, Kunikawa Maru, and Sanyo Maru. Frank states that Sendai and Suzuya contributed six Aichi E16A aircraft, but Suzuya was in Japan at this time (Hackett and Kingsepp, HIJMS SUZUYA: Tabular Record of Movement) but Kumano was at Kavieng. The 204th, 253rd, 582nd, and Zuikaku's Air Groups stationed their Zeros and Aichi D3A at Buin for the operation. The 252nd Air Group was deployed to the Shortlands airfield. The B-17 raid on 1 February was intercepted by five Zeros from the 253rd, 12 from the 204th, 14 from the 582nd, and 17 from the 252nd.
- Jersey, p. 376–378, Frank, p. 583, Morison, p. 364–365, Miller, p. 343–345, Zimmerman, p. 162. Patch's landing force consisted of the 2nd Battalion, 132nd Infantry Regiment, the 132nd's anti-tank company, an additional company (Company M) from the regiment, one platoon from the regiment's Company K, Battery F of the 10th Marines with 75mm pack howitzers, one platoon of the 65th Engineers, and detachments from the 101st Medical Regiment, 26th Signal Company, and service personnel. The Japanese dive bombers were from the 582nd Air Group escorted by 21 Zeros from the 582nd and 19 Zeros from Zuikaku's air group.
- Frank, p. 584–585, Morison, p. 366, Brown, p. 81, Jersey, p. 377. With the two destroyers were LCTs 63 and 181 whose machine-guns assisted in shooting at the attacking aircraft. Nicholas and other ships recovered 146 De Haven survivors. De Haven's captain was Charles E. Tolman. Two of Nicholas crew were killed in the attack. Destroyers Radford and Fletcher were still near Verahue with two other LCTs at the time of the raid. The four destroyers together made up Destroyer Squadron 21 under the command of Captain Robert Briscoe. Jersey says the LCTs involved in the operation were 58, 60, 62, 156, and 158.
- Frank, p. 585–586, 758, Morison, p. 366, Jersey, p. 392–393. Assigned as transports were Kazegumo, Makigumo, Yugumo, Akigumo, Tanikaze, Urakaze, Hamakaze, Isokaze, Tokitsukaze, Yukikaze, Oshio, and Arashio. Screening were Makinami, Maikaze, Kawakaze, Kuroshio, Shirayuki, Fumizuki, Satsuki, and Nagatsuki. A coastwatcher on Vella Lavella, either Henry Josselyn or John Keenan (Feldt, Eric, The Coast Watchers, Penguin Books, 1991 (1946), p. 241.) sighted the destroyers at 13:20 and notified Allied forces on Guadalcanal. The CAF aircraft claimed to have shot down 17 Zeros escorting the destroyers, but actual Japanese aircraft losses are unknown. After the attack, Makigumo and Yugumo were reassigned as escorts due to the departure of Makinami and Fumizuki. Makinami went to Japan for repairs, which were completed in September 1943 (Nevitt, CombinedFleet.com).
- Frank, p. 587–588, Morison, p. 367–368, Jersey, p. 393–395, Toland, p. 429–430. PT 111 was sunk by gunfire from Kawakaze at 22:54, suffering two crewmen killed. PT 37 was sunk by destroyer gunfire sometime later, with all but one of her crew killed (nine). PT 123 was bombed and sunk by an "R" Area aircraft, killing four.
- Frank, p. 587–588.
- Jersey, p. 391–392, Frank, p. 588. IJN personnel from the 4th Maizuru SNLF, under Commander Namihira Sasakawa, assisted with the loading. Sasakawa supervised the Cape Esperance embarkation point and Commander Tamao Shinohara the Kamimbo embarkation point.
- Griffith, p 285, Frank, p. 588, Morison, p. 367–368, Brown, p. 81, Dull, p. 268. Of the 5,000 evacuated this night, 2,316 were from the 38th Division, all that remained of the 8,000 originally landed on the island. U.S. destroyer-minelayers Tracy, Montgomery, and Preble had previously laid mines between Doma Cove and Cape Esperance and one of these may have claimed Makigumo. Five Makigumo crewmembers were killed, 237 were rescued (Nevitt, CombinedFleet.com). Eight 11th Air Fleet G4Ms attacked Henderson Field during the night, causing no damage. Six CAF SBD's attacked Hashimoto's force as it loaded the troops, also causing no damage. Among the troops evacuated this night was Tadayoshi Sano, commander of the 38th Division.
- Frank, p. 589–590, Jersey, p. 378–380, 383, 400–401, Miller p. 342–343, 346. The Japanese knew the approximate size of George's force after extracting the information from two American soldiers captured in a skirmish near Titi on the south coast. After their interrogations, the two Americans were summarily executed. Assisting the Yano Battalion, now numbering about 350 men after battle losses, were about 60 men from the 124th and 28th Infantry Regiments. On 3 February, the Japanese lost five G4M bombers from an abortive attack on Halsey's fleet, including one carrying Lieutenant Commander Genichi Mihara, commander of the 705th Air Group. The US 161st Regiment at this time was under the command of Colonel James Dalton II (Miller, p. 346).
- Frank, p. 590–591, Morison, p. 369–370, Jersey, p. 395, Dull, p. 268. US aircraft losses included four TBFs, three SBDs, three Wildcats, and one P-40. Maikaze went to Japan for repairs which were completed in July 1943 (Nevitt, CombinedFleet.com).
- Griffith, p 285, Frank, p. 591, Morison, p. 370. The evacuees included Masao Maruyama, commander of the 2nd Division. Japanese aircraft harassed Henderson Field and one PBY Catalina and five SBDs from the CAF tried to attack Hashimoto without success during the loading.
- Jersey, p. 391, 394, Frank, p. 592–591, Miller, p. 345–346. The Japanese rear guard was commanded by a Colonel Yutaka Matsuda.
- Jersey, p. 383, Frank, p. 593–594, Miller, p. 345–347.
- Frank, p. 594–595, Morison, p. 370, Jersey, p. 396, Dull, p. 268. The CAF strike force consisted of 15 SBDs, 20 Wildcats, and one F5A. The F5A and one of the 49 Zeros escorting the convoy were shot down. Ten crewmembers were killed on Isokaze, which was repaired at Truk and returned to action in March 1943 (Nevitt, CombinedFleet.com).
- Griffith, p 285–286, Frank, p. 595, Morison, p. 370, Jersey, p. 396–400, Dull, p. 268. According to Jersey, the Yano Battalion had lost a total of 101 men covering the withdrawal. Yūgumo and Akigumo retrieved the Japanese troops from the Russells.
- Jersey, p. 383, Frank, p. 596–597, Morison, p. 371, Miller, p. 346–348.
- Frank, p. 596–597, Morison, p. 370–371, Rottman, p. 64–65, D'Albas, p. 238, Griffith, p. 269, 286, Jersey, p. 400–401, Hayashi, p. 65–66. Morison and D'Albas say 11,706 were evacuated. Hayashi says 11,083. More recent historical accounts use the 10,652 number. Among the last soldiers evacuated were 264 members of the 28th Infantry Regiment, all that remained of the 1,945 landed in August and September 1942. Of the approximately 4,000 members of the 35th Infantry Brigade landed in August and September 1942, 618 were evacuated during Ke. IJN personnel evacuated numbered 870, the rest were IJA. Jersey says that "hundreds" of stragglers were left behind on Guadalcanal. The Japanese 51st Infantry Division was almost completely wiped out en route to New Guinea during the Battle of the Bismarck Sea in March 1943.
- Griffith, p. 285–286, Frank, p. 597, Zimmerman, p. 162.
- Frank, p. 597, Rottman, p. 64, Miller, p. 348–350.
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|Wikimedia Commons has media related to: Operation Ke|
- Hough, Frank O.; Ludwig, Verle E., and Shaw, Henry I., Jr. "Pearl Harbor to Guadalcanal". History of U.S. Marine Corps Operations in World War II. Retrieved 2006-05-16.
- Miller, John Jr. (1995) . Guadalcanal: The First Offensive. United States Army in World War II. United States Army Center of Military History. CMH Pub 5-3. Retrieved 2006-07-04.
- Parshall, Jon; Bob Hackett, Sander Kingsepp, & Allyn Nevitt. "Imperial Japanese Navy Page (Combinedfleet.com)". Retrieved 2006-06-14.
- Shaw, Henry I. (1992). "First Offensive: The Marine Campaign For Guadalcanal". Marines in World War II Commemorative Series. Retrieved 2006-07-25.
- Zimmerman, John L. (1949). "The Guadalcanal Campaign". Marines in World War II Historical Monograph. Retrieved 2006-07-04.