Step 1: Context.
Dr. Sadao, a Japanese surgeon, found a wounded American prisoner of war washed up near his house during World War II. Despite being his enemy, he decided to save him, guided by his sense of duty as a doctor.
Step 2: Medical help by Dr. Sadao.
He performed surgery on the prisoner to remove the bullet, cleaned his wounds, and provided regular medical treatment until the man recovered. His skills and humanitarian values prevailed over his sense of nationalism.
Step 3: Role of Hana.
Hana, though initially hesitant and fearful, stood by her husband. She helped him by assisting during the operation, giving the prisoner food and water, washing him, and taking care of him while he was recovering.
Final Answer:
Dr. Sadao saved the life of the American prisoner by operating on him and treating his wounds, while Hana helped by nursing him, feeding him, and supporting her husband despite social and political risks.