Today marks the 75th anniversary of the end of the Battle of Midway. The books and movies about this battle have been legion. They focus on the long odds facing the Americans, the luck and breathtaking courage, and the brilliance of American codebreakers that led to victory. They assert that the American victory sealed Japan’s fate in World War II. But they rarely consider in detail the consequences if America had lost the battle, which it might easily have done. The Japanese were also extraordinarily courageous. Had they been luckier, and had they changed the Japanese code well before the battle as they should have, Midway could have ended in the destruction of three American carriers, with the Japanese navy intact. On this anniversary, I want to consider the war had the battle gone Japan’s way.
The Pacific
The immediate consequence of a defeat at Midway would, of course, have been in the Pacific. The Japanese plan appears to have been to follow Midway with an assault on strategic islands in the South Pacific. They would have faced light forces on the islands and no naval threat. They would have taken islands, built airfields and constructed overlapping areas of air power that would have prevented merchant shipping from entering. The flow of U.S. troops and materiel to Australia would have slowed to a trickle or dried up altogether. This would have meant that the U.S. would not have taken Guadalcanal and New Guinea until much later. It also would have given Japan much more time to consolidate a line, for example, from Samoa to Midway to the Aleutians, which was also part of Japan’s Midway strategy.