Yesterday's Enemy (1959)

Cut off by the Japanese advance into Burma, Captain Langford (Stanley Baker) and his exhausted British troops take over an enemy-held jungle village.

Despite the protests of an elderly padre ('Guy Rolfe (I)') and of war correspondent Max Anderson (Leo McKern), Langford orders Sergeant McKenzie (Gordon Jackson) to shoot two innocent villagers, thereby "persuading" a Japanese informer to surrender vital information. When the Japanese recapture the village, their commander uses Langford's own desperate war-born tactics in a similar effort to extract information from the British.