Watch Prisoners (1975) Official Trailer

Melodrama set in South Vietnam in the 1960s. Krueger (Bramhall), a former infantry lieutenant, is imprisoned at Quai Dong, on the South China Sea, for refusing to fight. After a year at hard labor, he is told to use his Vietnamese language skills to question a Viet Cong suspect. The prisoner is drugged and tortured during the interrogation. Krueger eventually stops the torture by pretending that the prisoner has disclosed the location of a supply dump.