Cry of Battle (1963)
Cry of Battle is a 1963 coming of age story and war film based on the 1951 novel Fortress in the Rice by Benjamin Appel who was a journalist and special assistant to the U.S. Commissioner for the Philippines from 1945-46. The film stars Van Heflin, James MacArthur, Rita Moreno, Leopoldo Salcedo and Sidney Clute. Set during the Japanese occupation of the Philippines, the working title was To Be a Man.
More at Wikipedia.