The Red Angel (1966)

In 1939, Sakura Nishi is a young army nurse who is sent to the field hospitals in China during the Sino-Japanese war. She must assist surgeon Dr. Okabe with an incredible number of amputations. In the crowded wards, she gives sympathy to some of the soldiers, including sexually servicing one who has lost both arms and has no hope of returning home. She falls in love with Dr. Okabe and follows him to the front, although he is impotent from his morphine addiction.