Answer
The American Army Air Forces shot down Admiral Yamamoto over Bougainville in April 1943. The Japanese had developed a new code system that the Americans were unable to break. Yamamoto decided to personally lead a tour of the Solomon Islands, to inspect the defences and boost morale. He flew from Rabaul to Bougainville in a Nakajima B5N2 torpedo bomber, accompanied by six Zero fighters. A U.S.