On August 6, 1945, the U.S. B-29 bomber Enola Gay dropped the atom bomb on the Japanese city of Hiroshima. Co-pilot Robert Lewis wrote in his journal, “My God, what have we done?” The city was vaporized; the death toll estimated at over 200,000. Three days later a second bomb destroyed Nagasaki, bringing about the unconditional surrender of Japan and the end of World War II