Following World War II, the world's major powers signed treaties known as the Geneva Conventions, which outlawed barbaric treatment in war, including torture. However, prior to 1945, such international agreements were not in place, and torture was a common practice used for extracting information. Yamamoto's fate is horrific, though he dies a hero. He knows that if he gives up any information, more people will die, so he refuses to talk, even under the most extreme circumstances.