The Burmese Harp (1956)

When a Japanese platoon surrenders to British forces in Burma in 1943, the platoon's harp player, Mizushima (Shôji Yasui), is selected from the prisoners of war to deliver a request for surrender to a Japanese regiment holed up on a mountain. Mizushima fails to convince the soldiers to accept defeat, and a last stand commences. Traumatized by the bloodshed of his fellow countrymen, Mizushima disguises himself as a Buddhist monk and begins a journey toward peace of mind amid the chaos.