This is one of a series published by the U.S. Army Center of Military History and written by officers who held responsible positions in the Cambodian, Laotian, and South Vietnamese armed forces during the war in Indochina. Cambodia (the Khmer Republic from 1970 to 1975), immersed for five years in the conflict known in that region as the Indochina War, was in the category of a forgotten country. The war carried on during that period has been violently criticized by its enemies, ignored by some, and poorly understood by their friends. This monograph will serve to put these events into better perspective and to make clearer the Khmer point of view. Sections describe information about Cambodia and the communists, the armed forces of the Khmer Republic, the first two years of the war, the politico/military situation in Cambodia (1972-1974), major military operations (1972 through 1974), closing months (January-April 1975), and the final days of the Khmer Republic.