First off, the Allies warned Japan TWICE about the bombings. Also the use of the two atomic bombs finally forced japan to surrender bringing an end to the war and brutal Japanese colonialism era in Korea, parts of China, Philippines, Indonesia and many more. (Japan committed many war crimes in these countries).
The style they learned was the Guerrila Tactic.
Answer:
I don't remember what that ones called, but you gotta ask the question properly in order to get the answer you want.
I would pick a nobles were mouted horsemen
