The Bombing of Tokyo (東京大空襲, Tōkyōdaikūshū) was a series of firebombing air raids by the United States Army Air Force during the Pacific campaigns of World War II. Operation Meetinghouse, which was conducted on the night of 9–10 March 1945, is the single most destructive bombing raid in human history. 16 square miles (41 km2; 10,000 acres) of central Tokyo were destroyed, leaving an estimated 100,000 civilians dead and over one million homeless. In comparison, the atomic bombing of Nagasaki resulted in the immediate death of between 39,000 and 80,000 people.