 Yamamoto wanted to take the U.S. carriers out and get them out of the Pacific. That would allow the Japanese to continue their plans to dominate. Japanese had more ships involved that year, close to 150, with four of their main carriers from the Kito and Tai. The Americans had three carriers available, but they also were using Midway Isle as a fourth carrier, if you will. And it's sort of new Yamamoto's plan beforehand, so he was able to compensate for that and lay ambush. The U.S. carriers had rendezvous at a place called Point Block, roughly 350 miles northeast of Midway Isle. It definitely worked in their favor. Yamamoto had no idea that the U.S. carriers were there.