The purpose of this thesis was to determine the adequacy of current U.S. Army doctrine relative to encircled units and breakout operations in view of the problems encountered by the 31st Regimental Combat Team, U.S. 7th Infantry Division, on the eastern side of the Changjin [Chosin] Reservoir in North Korea from 26 November to 2 December 1950. Tactical doctrine was defined as authoritative guidance published by Headquarters, Department of the Army,...