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 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.