Question

why did General spare the American Soldier​

Answer 1

Answer:

... The General spared the American soldier because he was a selfish man. He thought of nothing but his own life. He needed Sadao for his operation and he forgot about his promise in his pain.

Answer 2

General spared the American soldier so that Dr. Sadao could be out of trouble and free to attend him. He did so by feigning to forget about his assurance to send assassians to kill the American and not out of generosity.