On 27 July 1943, the RAF killed 50,000 people in Hamburg. Reflecting on this barbarity, nuclear physicist Freeman Dyson who was then a clerk for Arthur "Bomber" Harris wrote that the Nazis "had sat in their offices, writing memoranda and calculating how to murder people efficiently, just like me. The main difference was that they were sent to jail or hanged as war criminals, while I went free." Eighty percent of all the bombs in World War II fell in the last ten months of the war during which the British, for instance, decided to bomb residential areas with the argument that this would foreshorten the war. The US borrowed this logic at Hiroshima and Nagasaki, but only after the USAF firebombed Tokyo on 8 May (General Curtis LeMay who directed the operations, said "we knew we were going to kill a lot of women and kids when we burned that town. Had to be done"). On 13 February 1945, the RAF killed 100,000 in Dresden; on 6 August 1945, the USAF killed 100,000 instantly in Hiroshima (another 100,000 died over the course of the next year).