Hell To Pay: Operation Downfall and the Invasion of Japan, 1945-1947 is a comprehensive and compelling examination of the myriad complex issues that comprised the strategic plans for the American invasion of Japan. U.S. planning for the invasion and military occupation of Imperial Japan was begun in 1943, two years before the dropping of atom bombs on Hiroshima and Nagasaki. In its final form, Operation Downfall called for a massive Allied invasionon a scale dwarfing "D-Day"to be carried out in two stages. In the first stage, Operation Olympic, the U.S. Sixth Army would lead the southern-most assault on the Home Island of Kyushu preceded by the dropping of as many as nine atom bombs behind the landing beaches. Sixth Army would secure airfields and anchorages needed to launch the second stage, Operation Coronet, 500 miles to the north in 1946. The decisive Coronet invasion of the industrial heartland of Japan through the Tokyo Plain would be led by the Eighth Army.