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Operation Ripper, also known as the Fourth Battle of Seoul, was a United Nations military operation conceived by the commander US Eighth Army, General Matthew Ridgway, during the Korean War. The operation was intended to destroy as much as possible of the Chinese communist People's Volunteer Army (PVA) and Korean People's Army (KPA) forces around Seoul and the towns of Hongch'on, 50 miles (80 km) east of Seoul, and Chuncheon, 15 miles (24 km) further south. The operation also aimed to bring UN troops to the 38th parallel. It followed upon the heels of Operation Killer, an eight-day UN offensive that concluded February 28, to push PVA/KPA forces north of the Han River. The operation was launched on March 6, 1951 with the US I Corps and IX Corps on the west near Seoul and Hoengsong and US X Corps and ROK III Corps in the east, to reach "Line Idaho", an arc with its apex just south of the 38th Parallel in South Korea.
Operation Ripper was preceded by the largest artillery bombardment of the Korean War. On the middle, the U.S. 25th Infantry Division quickly crossed the Han and established a bridgehead. Further to the east, IX Corps reached its first phase line on 11 March. Three days later the advance proceeded to the next phase line. During the night of March 14–15, elements of the South Korean 1st Infantry Division and the US 3rd Infantry Division liberated Seoul, marking the fourth and last time the capital changed hands since June 1950. The PVA/KPA forces were compelled to abandon it when the UN approach to the east of the city threatened them with encirclement.
Following the recapture of Seoul the PVA/KPA forces retreated northward, conducting skillful delaying actions that utilized the rugged, muddy terrain to maximum advantage, particularly in the mountainous US X Corps sector. Despite such obstacles, Operation Ripper pressed on throughout March. In the mountainous central region, the US IX and US X Corps pushed forward methodically, the IX Corps against light opposition and the X Corps against staunch enemy defenses. Hongch'on was taken on the 15th and Chuncheon secured on the 22nd. The capture of Chuncheon was the last major ground objective of Operation Ripper.
UN forces had advanced north an average of 30 miles (48 km) from their start lines. However, while the US Eighth Army had occupied their principal geographic objectives, the goal of destroying PVA forces and equipment had again proved elusive. More often than not, the PVA/KPA forces withdrew before they suffered extensive damage. Chuncheon, a major PVA/KPA supply hub, was empty by the time UN forces finally occupied it. As the U.N. troops ground forward, they were constantly descending sharp slopes or ascending steep heights to attack enemy positions that were sometimes above the clouds. By the end of March, US forces reached the 38th parallel.
- Bercuson, "Blood on the Hills", pp. 92–96.
- Varhola, Michael J. (2000). Fire and Ice: The Korean War, 1950-1953. Boston: Da Capo Press. p. 19.
- Appleman, Roy Edgar (1990). Ridgway Duels For Korea. College Station: Texas A&M University Press. ISBN 978-0-585-17479-2. OCLC 44956046.
- Bercuson, David J. (1999). Blood on the Hills: The Canadian Army in the Korean War. Toronto, Ontario, Canada: University of Toronto Press. ISBN 0-8020-0980-8.
- Blair, Clay (1988). The Forgotten War: America In Korea, 1950–53. New York: Time Books. ISBN 978-0-8129-1670-6. OCLC 69655036.
- Fehrenbach, T. R. (1963). This Kind Of War: A Study In Unpreparedness. New York: Macmillan. OCLC 412580.
- Mossman, Billy C. (1990). "Operation Ripper". Ebb And Flow: November 1950 – July 1951. United States Army In The Korean War. Washington, D.C.: United States Army Center of Military History. OCLC 19846599.
- Schnabel, James (1972). Policy And Direction: The First Year. United States Army In The Korean War. Washington, D.C.: United States Army Center of Military History. OCLC 186037004.