Yu Jae Hung was born in Nagoya, Aichi, Japan, in August 3, 1921. He was the second child of the Army general, Yu Seung Yeol (1891-1968) and his Japanese wife. He graduated from the Military Academy of Japan.
At the time of Japan's surrender, Yu Jae Hung had been a battalion commander in the Japanese Army. When the ROK Army was first formed, he served as a Colonel. When the Cheju Uprising occurred, he and his forces were sent to the island to restore order. There was heavy fighting on the island but he finally was able to pacify the situation by promising not to prosecute those who surrendered.
At the outset of the Korean War, Brigadier General Yu Jae Hung was commanding ROK 7th Division. After the invasion of South Korea proved to be too much, he was part of the effort to conduct a tactical withdrawal to the Naktong River.
After organizing defenses at the river and receiving US aide, the ROK Army was reorganized and outfitted. As of July 1950, Yu Jae Hung was commanding the ROK II Corps. As of September 1950, The II Corps was in Hayang defending the Naktong Line.
After the September Offensive by the North Korean Army had strained the defenses of the ROK II Corps. General Yu ordered the ROK 6th Division and 8th Division under his command to send a regiment each to retake Yongchon. The attempt was largely unsuccessful and General Yu's requests for US armor support were not always met but crucial to the retaking of the hill. Yongchon was lost and retaken on two occasions. Captured Inmin-gun documents showed that Kim Il Sung considered the hill to be a crucial strategic point and vital to winning the war but failed repeatedly in his attempts. Gen. Yu's defense of the area was later commemorated by a monument in his honor.
Pushing into North Korea, 1950
In October 1950, after a successful landing at Inchon, North Korean troops retreated and UN forces pushed north into North Korea in. During the advance, Maj. Gen. Yu was on the central front. He made it as far as Chorwon before stopping. ROK Army Chief of Staff Chung Il Kwon wanted a Korean Unit to be the first to enter Pyongyang so he had Maj. Gen. Yu sent a regiment to take the city. They encountered pockets of resistance but the unorganized nature of it made the task easy to accomplish.
Promotion to the Korean Army Deputy Chief of Staff
Upon realizing the nature of the Chinese attack and vulnerability of his old corps, Yu wanted to return to their aid. The resupply drops that had been promised to him by General Walker were much smaller than expected and the ROK II Corps was decimated. Yu considered this to be the most challenging time for him during the war.
The Second Spring Offensive
On January 9, 1951 Maj. Gen. Yu Jae Hung was appointed to be the ROK III Corps commander. The Chinese attack, known as the Second Spring Offensive, was handled by US and Korean forces fairly well. The Chinese, though numerous, were poorly supplied and the now battle-hardened and well supplied ROK lines held strong. The fighting ended by May 1951 and the ensuing stalemate lasted until the armistice.
After his retirement as Lieutenant General in July 1960, Yu was appointed as the Korean Ambassador to Thailand (August 1960-August 1963), Sweden (August 1963-September 1967), Italy (November 1967-February 1971) and Minister of National Defense between August 1971 and December 1973. He died November 26, 2011 at the age of 91 in Seoul, South Korea.
Legion of Merit, 1st
The President of the United States of America, authorized by Act of Congress, 20 July 1942, takes pleasure in presenting the Legion of Merit, in the Degree of Officer to Brigadier General Yu Jae Hung, Korean Army, for exceptionally meritorious conduct in the performance of outstanding services to the Government of the United States from 25 June to 31 August 1950.
Legion of Merit, 2nd
The President of the United States of America, authorized by Act of Congress, 20 July 1942, takes pleasure in presenting a Bronze Oak Leaf Cluster in lieu of a Second Award of the Legion of Merit, In the Degree of Officer to Lieutenant General Yu Jae Hung, Republic of Korea Army, for exceptionally meritorious conduct in the performance of outstanding services to the Government of the United States from 28 January to 8 May 1952 and from 23 July 1952 to 1 February 1953.
- Lee, Bong (2003). The Unfinished War: Korea. Algora Publishing.
- Paik, Sun Yup (1992). From Pusan to Panmunjom. Potomac Books, Inc.
- The Korean War: Volume 2. University of Nebraska Press.
- "War: Late Entry". Time. 1950-11-06. ISSN 0040-781X. Retrieved 2015-12-09.
- 외교안보연구원 교학과 (ed.), 헌국외교 60년 (PDF) (in Korean), 대한민국 외교통상부, p. 493, 505, 508, archived from the original (PDF) on 2016-03-04
- "Valor awards for Yu Jae Hung". valor.militarytimes.com. Retrieved 2015-12-08.
- Korea Institute of Military History. The Korean War. Lincoln: University of Nebraska Press, 2000. 3 vols. ISBN 0803278020 OCLC 44502379
- Lee, Bong. The Unfinished War: Korea. New York: Algora Pub, 2003. ISBN 0875862179 OCLC 51977966
- Paek, Sŏn-yŏp. From Pusan to Panmunjom. Washington: Brassey's (US), 1992. ISBN 0028810023 OCLC 24908105