This is the fourth in a series of five volumes dealing with the operations of United States Marines in Korea during the period 2 August 1950 to 27 July 1953. Volume IV presents in detail the operations of the 1st Marine Division and 1st Marine Aircraft Wing, the former while operating under Eighth Army control and also as part of IX Corps and X Corps, USA, and the latter while controlled by the Fifth Air Force. The period covered in this volume begins in the latter part of December 1950, when the Division rested in the Masan “bean patch,” and continues through the guerrilla hunt, the Punchbowl fighting, and all other operations during 1951. The account ends when the Marines move to positions in the west during March 1952. - Summary by H. W. Buse, Jr.