The Jamestown Line was a series of defensive positions occupied by United Nations forces in the Korean War. Following the end of the 1951 Chinese Spring Offensive and the UN May-June 1951 counteroffensive the war largely became one of attrition and trench warfare, fought along static defensive lines reminiscent of the First World War. As a consequence major UN ground operations from late spring—under the direction of Lieutenant General Matthew Ridgway—were primarily conducted to recapture or establish durable defensive lines, including the Wyoming, Missouri, Kansas and Jamestown Lines. The Jamestown Line stretched from the Imjin River near Munsan-ni then arched northeast 35 miles (56 km) in the strategically important sector of front from the Kimpo peninsula on the Yellow Sea coast to a point east of Kumhwa.
The line was subsequently established during the UN counter-offensive between May and November 1951, just north of the 38th parallel during Operation Commando (1951). Held by the US I Corps, this sector was just 30 miles (48 km) from the South Korean capital, Seoul. Five UN divisions of I Corps were used in its capture, including the US 1st Cavalry Division, the US 3rd and 25th Infantry Divisions, the South Korean 1st Division, and the 1st Commonwealth Division. The Jamestown line was fought over almost continuously until the armistice on 27 July 1953; due to its strategic position it was the scene of much heavy fighting, including the Battle of the Samichon River just hours before the Armistice Agreement which ended the war.
- O'Neill 1985, pp. 208–242.
- Varhola 2000, p. 21.
- Grey 1988, p. 135.
- Varhola 2000, p. 22.
- Grey 1988, p. 133–135.
- Coulthard-Clark 2001, p. 269.
- Coulthard-Clark, Chris (2001). The Encyclopaedia of Australia's Battles (Second ed.). Crows Nest: Allen and Unwin. ISBN 1-86508-634-7.
- Grey, Jeffrey (1988). The Commonwealth Armies and the Korean War. Manchester: Manchester University Press. ISBN 0-7190-2770-5.
- O’Neill, Robert (1985). Australia in the Korean War 1950−53. Volume II. Combat Operations. Canberra: Australian War Memorial. ISBN 0-642-04330-2.
- Varhola, Michael (2000). Fire and Ice: the Korean War, 1950–1953. New York: Da Capo Press. ISBN 1-882810-44-9.
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