page_title: Strategic bombing during World War II
section_title: Conventional bombing
hierarchical_section_title: Strategic bombing during World War II / Asia / U.S. bombing of Japan / Conventional bombing
caption_attribution_description: English: Bomb damage to Tokyo following United States raids on the city during World War II
context_page_description: Strategic bombing during World War II was the sustained aerial attack on railways, harbours, cities, workers' and civilian housing, and industrial districts in enemy territory during World War II. Strategic bombing is a military strategy which is distinct from both close air support of ground forces and tactical air power.
  During World War II, it was believed by many military strategists of air power that major victories could be won by attacking industrial and political infrastructure, rather than purely military targets. Strategic bombing often involved bombing areas inhabited by civilians and some campaigns were deliberately designed to target civilian populations in order to terrorize them and disrupt their usual activities. International law at the outset of World War II did not specifically forbid aerial bombardment of cities despite the prior occurrence of such bombing during World War I, the Spanish Civil War, and the Second Sino-Japanese War.
  Strategic bombing during World War II began on 1 September 1939 when Germany invaded Poland and the Luftwaffe began bombing cities and the civilian population in Poland in an indiscriminate aerial bombardment campaign.
context_section_description: The first U.S. raid on the Japanese main island was the Doolittle Raid of 18 April 1942, when sixteen B-25 Mitchells were launched from the USS Hornet (CV-8) to attack targets including Yokohama and Tokyo and then fly on to airfields in China. The raid was a military pinprick but a significant propaganda victory. Because they were launched prematurely, none of the aircraft had enough fuel to reach their designated landing sites, and so either crashed or ditched (except for one aircraft, which landed in the Soviet Union, where the crew was interned). Two crews were captured by the Japanese.
  The key development for the bombing of Japan was the B-29 Superfortress, which had an operational range of 1,500 miles (2,400 km); almost 90% of the bombs (147,000 tons) dropped on the home islands of Japan were delivered by this bomber. The first raid by B-29s on Japan was on 15 June 1944, from China. The B-29s took off from Chengdu, over 1,500 miles away. This raid was also not particularly effective: only forty-seven of the sixty-eight bombers hit the target area.
  Raids of Japan from mainland China, called Operation Matterhorn, were carried out by the Twentieth Air Force under XX Bomber Command. Initially the commanding officer of the Twentieth Air Force was Hap Arnold, and later Curtis LeMay. Bombing Japan from China was never a satisfactory arrangement because not only were the Chinese airbases difficult to supply—materiel being sent by air from India over "the Hump"—but the B-29s operating from them could only reach Japan if they traded some of their bomb load for extra fuel in tanks in the bomb-bays. When Admiral Chester Nimitz's island-hopping campaign captured Pacific islands close enough to Japan to be within the B-29's range, the Twentieth Air Force was assigned to XXI Bomber Command, which organized a much more effective bombing campaign of the Japanese home islands. Based in the Marianas (Guam and Tinian in particular), the B-29s were able to carry their full bomb loads and were supplied by cargo ships and tankers. The first raid from the Mariana was on 24 November 1944, when 88 aircraft bombed Tokyo. The bombs were dropped from around 30,000 feet (10,000 m) and it is estimated that only around 10% hit their targets.
  Unlike all other forces in theater, the USAAF Bomber Commands did not report to the commanders of the theaters but directly to the Joint Chiefs of Staff. In July 1945, they were placed under the U.S. Strategic Air Forces in the Pacific, which was commanded by General Carl Spaatz.
  As in Europe, the United States Army Air Forces (USAAF) tried daylight precision bombing. However, it proved to be impossible due to the weather around Japan, "during the best month for bombing in Japan, visual bombing was possible for [just] seven days. The worst had only one good day." Further, bombs dropped from a great height were tossed about by high winds.
  General LeMay, commander of XXI Bomber Command, instead switched to mass firebombing night attacks from altitudes of around 7,000 feet (2,100 m) on the major conurbations. "He looked up the size of the large Japanese cities in the World Almanac and picked his targets accordingly." Priority targets were Tokyo, Nagoya, Osaka, and Kobe. Despite limited early success, particularly against Nagoya, LeMay was determined to use such bombing tactics against the vulnerable Japanese cities. Attacks on strategic targets also continued in lower-level daylight raids.
  The first successful firebombing raid was on Kobe on 3 February 1945, and following its relative success the USAAF continued the tactic. Nearly half of the principal factories of the city were damaged, and production was reduced by more than half at one of the port's two shipyards.
  The first raid of this type on Tokyo was on the night of 23–24 February when 174 B-29s destroyed around one square mile (3 km²) of the city. Following on that success, as Operation Meetinghouse, 334 B-29s raided on the night of 9–10 March, of which 282 Superforts reached their targets, dropping around 1,700 tons of bombs. Around 16 square miles (41 k
caption: This postwar photograph shows the district of Sumida, Tokyo being virtually flattened.
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