1945 : Japanese sink the USS Indianapolis On this day in 1945, Japanese warships sink the American cruiser Indianapolis, killing 883 seamen in the worst loss in the history of the U.S. navy. As a prelude to a proposed invasion of the Japanese mainland, scheduled for November 1, U.S. forces bombed the Japanese home islands from sea and air, as well as blowing Japanese warships out of the water. The end was near for Imperial Japan, but it was determined to go down fighting. Just before midnight of the 29th, the Indianapolis, an American cruiser that was the flagship of...