Atomic bombings of Hiroshima and Nagasaki
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Atomic bombings of Hiroshima and Nagasaki
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Part of the Pacific War, World War II
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Atomic bomb mushroom clouds over Hiroshima (left) and Nagasaki(right)
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Belligerents
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Commanders and leaders
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Units involved
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Casualties and losses
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None
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90,000–166,000 killed in Hiroshima[1]
60,000–80,000 killed in Nagasaki[1]
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The atomic bombings of the cities of Hiroshima and Nagasaki in Japan were conducted by the United Statesduring the final stages of World War II in 1945. These two events represent the only use of nuclear weapons in war to date.
Following a firebombing campaign that destroyed many Japanese cities, the Allies prepared for a costly invasion of Japan. The war in Europe ended when Nazi Germanysigned its instrument of surrender on 8 May, but thePacific War continued. Together with the United Kingdomand the Republic of China, the United States called for a surrender of Japan in the Potsdam Declaration on 26 July 1945, threatening Japan with "prompt and utter destruction". The Japanese government ignored this ultimatum, and the United States deployed two nuclear weapons developed by the Manhattan Project. American airmen dropped Little Boy on the city of Hiroshima on 6 August 1945, followed by Fat Man over Nagasaki on 9 August.
Within the first two to four months of the bombings, the acute effects killed 90,000–166,000 people in Hiroshima and 60,000–80,000 in Nagasaki, with roughly half of the deaths in each city occurring on the first day. The Hiroshima prefecture health department estimated that, of the people who died on the day of the explosion, 60% died from flash or flame burns, 30% from falling debris and 10% from other causes. During the following months, large numbers died from the effect of burns,radiation sickness, and other injuries, compounded by illness. In a US estimate of the total immediate and short term cause of death, 15–20% died from radiation sickness, 20–30% from burns, and 50–60% from other injuries, compounded by illness. In both cities, most of the dead were civilians, although Hiroshima had a sizeable garrison.
On 15 August, six days after the bombing of Nagasaki, Japan announced its surrender to the Allies, signing theInstrument of Surrender on 2 September, officially ending World War II. The bombings led, in part, to post-war Japan's adopting Three Non-Nuclear Principles, forbidding the nation from nuclear armament. The role of the bombings in Japan's surrender and their ethical justification are still debated.
Background
Pacific War
Main article: Pacific War
In 1945, the Pacific War between the Empire of Japan and the Allies of World War II had entered its fourth year.World War II was not winding down. Instead, the fighting was being prosecuted with ever-increasing fury. Of the 1.25 million battle casualties incurred by the United States in World War II, nearly one million occurred in the twelve month period from June 1944 to June 1945. December 1944 saw American battle casualties hit an all-time monthly high of 88,000 as a result of the German Ardennes Offensive.[2]
In the Pacific during this period, the Allies captured the Mariana and Palau Islands,[3] returned to the Philippines,[4] and invaded Borneo.[5] The policy of bypassing Japanese forces was abandoned. In order to free troops for use elsewhere, offensives were undertaken to reduce the Japanese forces remaining in Bougainville,New Guinea and the Philippines.[6] In April 1945, American forces had landed on Okinawa, where heavy fighting would continue until June. Along the way, the ratio of Japanese deaths to American casualties dropped from 5 to 1 in the Philippines to 2 to 1 on Okinawa.[2]
Preparations to invade Japan
Main article: Operation Downfall
Even before the surrender of Nazi Germany on 8 May 1945, plans were already underway for the largest operation of the Pacific War, Operation Downfall, the invasion of Japan.[7] The operation had two parts: Operations Olympic and Coronet. Set to begin in October 1945, Olympic involved a series of landings by the US Sixth Army intended to capture the southern third of the southernmost main Japanese island, Kyūshū.[8] Operation Olympic was to be followed in March 1946 by Operation Coronet, the capture of the Kantō Plain, near Tokyo on the Japanese island of Honshūby the US First, Eighth and Tenth Armies. The target date was chosen to allow for Olympic to complete its objectives, troops to be redeployed from Europe, and the Japanese winter to pass.[9]
Japan's geography made this invasion plan obvious to the Japanese as well; they were able to predict the Allied invasion plans accurately and thus adjust their defensive plan, Operation Ketsugō, accordingly. The Japanese planned an all-out defense of Kyūshū, with little left in reserve for any subsequent defense operations.[10] Four veteran divisions were withdrawn from the Kwantung Army in Manchuria in March 1945 to strengthen the forces in Japan,[11] and 45 new divisions were activated between February and May 1945. Most were immobile formations for coastal defence, but 16 were high quality mobile divisions.[12] In all, there were 2.3 million Japanese Army troops prepared to defend the Japanese home islands, another 4 million Army and Navy employees, and a civilian militia of 28 million men and women. Casualty predictions varied widely, but were extremely high. The Vice Chief of the Imperial Japanese Navy General Staff, Vice Admiral Takijirō Ōnishi, predicted up to 20 million Japanese deaths.[13]
A study from 15 June 1945 by the Joint War Plans Committee,[14] who provided planning information to the Joint Chiefs of Staff, estimated that Olympic would result in between 130,000 and 220,000 US-casualties of which U.S. dead would be the range from 25,000 to 46,000. Delivered on 15 June 1945 after insight gained from the Battle of Okinawa, the study noted Japan's inadequate defenses due to the very effective sea blockade and the American firebombing campaign. The Chief of Staff of the United States Army, General of the Army George C. Marshall and General of the Army Douglas MacArthursigned documents agreeing with the Joint War Plans Committee estimate.[15]
The Americans were alarmed by the Japanese build up, which was accurately tracked through Ultra intelligence.[16] United States Secretary of War Henry Lewis Stimson was sufficiently concerned about high American estimates of probable casualties to commission his own study by Quincy Wright and William Shockley. Wright and Shockley spoke with Colonels James McCormack andDean Rusk, and examined casualty forecasts by Michael DeBakey and Gilbert Beebe. Wright and Shockley estimated the invading Allies would suffer between 1.7 and 4 million casualties in such a scenario, of whom between 400,000 and 800,000 would be dead, while Japanese casualties would have been around 5 to 10 million.[17][18]
Marshall began contemplating the use of a weapon which was "readily available and which assuredly can decrease the cost in American lives":[19] poison gas. Quantities of phosgene, mustard gas, tear gas andcyanogen chloride were moved to Luzon from stockpiles in Australia and New Guinea in preparation for Operation Olympic, and General of the Army Douglas MacArthur ensured that Chemical Warfare Service units were trained in their use.[19]
Air raids on Japan
Main article: Air raids on Japan
While the United States had developed plans for an air campaign against Japan prior to the Pacific War, the capture of Allied bases in the western Pacific in the first weeks of the conflict meant that this offensive did not begin until mid-1944 when the long-ranged Boeing B-29 Superfortress became ready for use in combat. Operation Matterhorn involved India-based B-29s staging through bases aroundChengtu in China to make a series of raids on strategic targets in Japan between June 1944 and January 1945. This effort proved unsuccessful due to logistical difficulties with the remote location, technical problems with the new and advanced aircraft, unfavourable weather conditions, and ultimately enemy action.[20]
USAAF Brigadier General Haywood S. Hansell determined that Guam,Tinian and Saipan in the Mariana Islands would better serve as B-29 bases, but they were in Japanese hands. Strategies were shifted to accommodate the air war, and the islands were captured between June and August 1944. Air bases were developed, and B-29 operations commenced from the Marianas in November 1944, greatly expanding the scope of the strategic bombing campaign against Japan.[20]
These attacks initially targeted key industrial facilities, but from March 1945 they were frequently directed against urban areas. The capture of Okinawa in June 1945 provided airfields even closer to the Japanese mainland, allowing the bombing campaign to be escalated further. Over the next six months, the XXI Bomber Commandfire-bombed 67 Japanese cities. The Operation Meetinghouse 9–10 March Bombing of Tokyo caused 80,000–100,000 casualties and destroyed 16 square miles (41 km2) of the city with 267,000 buildings–the deadliest of the war. Aircraft flying from Allied aircraft carriers and the Ryukyu Islands also regularly struck targets in Japan during 1945 in preparation for Operation Downfall.[21]
The Japanese military was unable to stop the Allied attacks, and the country's civil defense preparations proved inadequate. From April 1945, the Japanese Army and Naval Air Forces stopped attempting to intercept the air raids in order to preserve fighter aircraft to counter the expected invasion.[22] By mid-1945 the Japanese also only occasionally scrambled aircraft to intercept individual B-29s conducting reconnaissance sorties over the country in order to conserve supplies of fuel.[23] By July 1945, the Japanese had stockpiled 1,156,000 US barrels (137,800,000 l; 36,400,000 US gal; 30,300,000 imp gal) of avgas for the invasion of Japan.[24]
Atomic bomb development
Main article: Manhattan Project
Working in collaboration with the United Kingdom and Canada, with their respective projects Tube Alloys andChalk River Laboratories,[25][26] the Manhattan Project, under the direction of Major General Leslie Groves, of theU.S. Army Corps of Engineers, designed and built the first atomic bombs.[27] Preliminary research began in 1939, originally in fear that the Nazi atomic bomb project would develop atomic weapons first.[28] In May 1945, thedefeat of Germany caused the focus to turn to use against Japan.[29]
Two types of bombs were eventually devised by scientists and technicians at Los Alamos under Americanphysicist Robert Oppenheimer. The Hiroshima bomb, known as Little Boy, was a gun-type fission weapon made with uranium-235, a rare isotope of uranium extracted in giant factories in Oak Ridge, Tennessee.[30] The other was an implosion-type nuclear weapon using plutonium-239, a synthetic element created in nuclear reactors atHanford, Washington. A test implosion weapon, the gadget, was detonated at Trinity Site, on 16 July 1945, nearAlamogordo, New Mexico.[31] The Nagasaki bomb, Fat Man was also an implosion device.[32]
Preparations
Organization and training
The 509th Composite Group was constituted on 9 December 1944, and activated on 17 December 1944, at Wendover Army Air Field,Utah, commanded by Colonel Paul W. Tibbets.[33] Tibbets was assigned to organize and command a combat group to develop the means of delivering an atomic weapon against targets in Germany and Japan. Because the flying squadrons of the group consisted of both bomber and transport aircraft, the group was designated as a "composite" rather than a "bombardment" unit.
Working with the Manhattan Project at Site Y in Los Alamos, New Mexico, Tibbets selected Wendover for his training base over Great Bend, Kansas, and Mountain Home, Idaho because of its remoteness.[34] On 10 September 1944, the 393rd Bomb Squadron, aB-29 Superfortress unit, arrived at Wendover from the 504th Bombardment Group (Very Heavy) at Fairmont Army Air Base, Nebraska, where it had been in group training since 12 March. When its parent group deployed to the Mariana Islands in early November 1944, the squadron was assigned directly to the Second Air Force until creation of the 509th Composite Group.[35] Originally consisting of twenty-one crews, fifteen were selected to continue training and were organized into three flights of five crews, lettered A, B, and C.
The 320th Troop Carrier Squadron, the other flying unit of the 509th, came into being because of the highly secret work of the group. The organization that was to become the 509th required its own transports for the movement of both personnel and materiel, resulting in creation of an ad hoc unit nicknamed "The Green Hornet Line".[35][36]Crews for this unit were acquired from the six 393rd crews not selected to continue B-29 training, some of whom chose to remain with the 509th rather than be assigned to a replacement pool of the Second Air Force. They began using Curtiss C-46 Commandos and C-47 Skytrains already at Wendover, and after November 1944 flew five acquired C-54 Skymasters.[37] The 320th Troop Carrier was formally activated at the same time as the group.[33]
Other support units were activated at Wendover from personnel already present and working with its Project W-47, which was later superseded by Project Alberta, or in the 216th Base Unit, both of which were affiliated with the Project Y. The 390th Air Service Group was created as the command echelon for the 603rd Air Engineering Squadron, the 1027th Air Material squadron, and its own Air Base Support Squadron, but as these units became independent operationally, acted as the basic support unit for the entire 509th Composite Group in providing quarters, rations, medical care, postal service and other basic support functions. The 603rd Air Engineering Squadron was unique in that it provided depot-level B-29 maintenance in the field, obviating the necessity of sending aircraft back to the United States for major repairs. The 603rd made a number of modifications to the first contract order of Silverplate B-29s that were later incorporated as specifications for the combat models.
The 393rd Bomb Squadron began replacement of its original B-29s with modified Silverplate aircraft with the delivery of three new B-29s in mid-October 1944.[36] These aircraft had extensive bomb bay modifications and a "weaponeer" station installed, but initial training operations identified numerous other modifications necessary to the mission, particularly in reducing the overall weight of the aircraft to offset the heavy loads it would be required to carry. Five more Silverplates were delivered in November and six in December, giving the group 14 for its training operations. In January and February 1945, 10 of the 15 crews under the command of the Group S-3 (operations officer) were assigned temporary duty at Batista Field, San Antonio de los Baños, Cuba, where they trained in long-range over-water navigation.[38]
On 6 March 1945, the 1st Ordnance Squadron (Special, Aviation) was activated at Wendover, again from Army Air Forces personnel on hand or already at Los Alamos, and concurrent with the activation of Project Alberta. Its purpose was to provide trained personnel and special equipment to the group to enable it to assemble atomic weapons at its operating base, thereby allowing the weapons to be transported more safely in their component parts. A rigorous candidate selection process was used to recruit personnel, with reportedly an 80% "washout" rate, and those made a part of the unit were not permitted transfer until the end of the war, nor were they allowed to travel without escorts from Military Intelligence units.[39]
With the addition of the 1st Ordnance Squadron to its roster, the 509th Composite Group had an authorized strength of 225 officers and 1,542 enlisted men, almost all of whom deployed to Tinian. The 320th Troop Carrier Squadron did not officially deploy but kept its base of operations at Wendover. In addition to its authorized strength, the 509th had attached to it on Tinian 51 civilian and military personnel of Project Alberta,[40] known as the 1st Technical Detachment.[41] There were two representatives from Washington, D.C., Brigadier GeneralThomas Farrell, the deputy commander of the Manhattan Project, and Rear Admiral William R. Purnell of the Military Policy Committee.[42] They were on hand to decide higher policy matters on the spot. Along with CaptainWilliam S. Parsons, the commander of Project Alberta, they became known as the "Tinian Joint Chiefs".[43]
The 509th began replacement of its 14 training Silverplates in February 1945 by transferring four to the 216th Base Unit. In April they began receiving Silverplates of the third modification increment and the remaining ten training B-29s were placed in storage. Each bombardier completed at least 50 practice drops of inert pumpkin bombs and Tibbets declared his group combat-ready.[44] Preparation for Overseas Movement (POM) began in April.
Choice of targets
General of the Army George Marshall, the Chief of Staff of the Army, asked Groves to nominate specific targets for bombing, subject to approval by himself and Secretary of War Henry L. Stimson. Groves formed a Target Committee in April 1945 chaired by himself, that included his deputy, Brigadier General Thomas Farrell; one of his staff, Major John A. Derry; Colonel William P. Fisher, Joyce C. Stearns and David M. Dennison from the USAAF; and scientists John von Neumann, Robert R. Wilson and William C. Penney from the Manhattan Project. The Target Committee met on 27 April; at Los Alamos on 10 May, where it was able to talk to the scientists and technicians there; and finally in Washington on 28 May, where it was briefed by Colonel Paul Tibbetsand Commander Frederick L. Ashworth, and the Manhattan Project's scientific advisor, Richard C. Tolman.[45]
The Target Committee nominated four targets: Kokura, the site of one of Japan's largest munitions plants; Hiroshima, an embarkation port and industrial center that was the site of a major military headquarters; Niigata, a port with industrial facilities including steel and aluminium plants and an oil refinery; and Kyoto, a major industrial center. The target selection was subject to the following criteria:
- The target was larger than 3 miles (4.8 km) in diameter and was an important target in a large urban area.
- The blast would create effective damage.
- The target was unlikely to be attacked by August 1945. "Any small and strictly military objective should be located in a much larger area subject to blast damage in order to avoid undue risks of the weapon being lost due to bad placing of the bomb."[46]
These cities were largely untouched during the nightly bombing raids and the Army Air Force agreed to leave them off the target list so accurate assessment of the weapon could be made. Hiroshima was described as "an important army depot and port of embarkation in the middle of an urban industrial area. It is a good radar target and it is such a size that a large part of the city could be extensively damaged. There are adjacent hills which are likely to produce a focusing effect which would considerably increase the blast damage. Due to rivers it is not a good incendiary target."[46] The US had previously dropped leaflets warning civilians of air raids on 35 Japanese cities, including Hiroshima and Nagasaki.[47]
The goal of the weapon was to convince Japan to surrender unconditionally in accordance with the terms of thePotsdam Declaration. The Target Committee stated that "It was agreed that psychological factors in the target selection were of great importance. Two aspects of this are (1) obtaining the greatest psychological effect against Japan and (2) making the initial use sufficiently spectacular for the importance of the weapon to be internationally recognized when publicity on it is released. Kyoto had the advantage of being an important center for military industry, as well an intellectual center and hence better able to appreciate the significance of the weapon. TheEmperor's palace in Tokyo has a greater fame than any other target but is of least strategic value."[46]
Edwin O. Reischauer, a Japan expert for the US Army Intelligence Service, was incorrectly said to have prevented the bombing of Kyoto.[46] In his autobiography, Reischauer specifically refuted this claim:
...the only person deserving credit for saving Kyoto from destruction is Henry L. Stimson, the Secretary of War at the time, who had known and admired Kyoto ever since his honeymoon there several decades earlier.[48]
Potsdam ultimatum
On 26 July, Allied leaders issued the Potsdam Declaration outlining terms of surrender for Japan. It was presented as an ultimatum and stated that without a surrender, the Allies would attack Japan, resulting in "the inevitable and complete destruction of the Japanese armed forces and just as inevitably the utter devastation of the Japanese homeland". The atomic bomb was not mentioned in the communiqué. On 28 July Japanese papers reported that the declaration had been rejected by the Japanese government. That afternoon, Prime MinisterKantarō Suzuki declared at a press conference that the Potsdam Declaration was no more than a rehash (yakinaoshi) of the Cairo Declaration and that the government intended to ignore it (mokusatsu, "kill by silence").[50] The statement was taken by both Japanese and foreign papers as a clear rejection of the declaration. Emperor Hirohito, who was waiting for a Soviet reply to non-committal Japanese peace feelers, made no move to change the government position.[51]
Under the 1943 Quebec Agreement with the United Kingdom, the United States had agreed that nuclear weapons would not be used against another country without mutual consent. In June 1945 the head of the British Joint Staff Mission, Field Marshal Sir Henry Maitland Wilson, agreed that the use of nuclear weapons against Japan would be officially recorded as a decision of the Combined Policy Committee.[52] At Potsdam, Truman agreed to a request from the Prime Minister of the United Kingdom, Winston Churchill, that Britain be represented when the atomic bomb was dropped. William Penney and Group Captain Leonard Cheshire were sent to Tinian, but found that Major General Curtis LeMay would not let them accompany the mission. All they could do was send a strongly worded signal back to Wilson.[53]
Hiroshima
Hiroshima during World War II
At the time of its bombing, Hiroshima was a city of both industrial and military significance. A number of military camps were located nearby, including the headquarters of Field Marshal Shunroku Hata's 2nd General Army Headquarters, which commanded the defense of all of southern Japan.[54] His command consisted of some 400,000 men, most of whom were on Kyushu where an Allied invasion was correctly expected.[55] Also present in Hiroshima was the headquarters of theFifty-Ninth Army, and most of the 224th Division, a recently formed mobile unit.[56] The city's air defenses comprised five batteries of 7-and-8-centimetre (2.8 and 3.1 in) anti-aircraft guns.[57]
Hiroshima was a minor supply and logistics base for the Japanese military. The city was a communications center, a storage point, and an assembly area for troops. It was one of several Japanese cities left deliberately untouched by American bombing, allowing a pristine environment to measure the damage caused by the atomic bomb.[58]
The center of the city contained several reinforced concrete buildings and lighter structures. Outside the center, the area was congested by a dense collection of small wooden workshops set among Japanese houses. A few larger industrial plants lay near the outskirts of the city. The houses were constructed of wood with tile roofs, and many of the industrial buildings were also built around wood frames. The city as a whole was highly susceptible to fire damage.[59]
The population of Hiroshima had reached a peak of over 381,000 earlier in the war, but prior to the atomic bombing the population had steadily decreased because of a systematic evacuation ordered by the Japanese government. At the time of the attack, the population was approximately 340,000–350,000.[1]
The bombing
Hiroshima was the primary target of the first nuclear bombing mission on 6 August, with Kokura and Nagasaki as alternative targets. The 393d Bombardment Squadron B-29 Enola Gay, piloted by Tibbets, took off from North Field airbase on Tinian, about six hours flight time from Japan. The Enola Gay (named after Tibbets' mother) was accompanied by two other B-29s. The Great Artiste, commanded by Major Charles W. Sweeney, carried instrumentation, and a then-nameless aircraft later called Necessary Evil, commanded by Captain George Marquardt, served as the photography aircraft.[35]
Aircraft
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Pilot
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Call Sign
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Mission role
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Major Claude R. Eatherly
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Dimples 85
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Weather reconnaissance (Hiroshima)
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Major John A. Wilson
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Dimples 71
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Weather reconnaissance (Kokura)
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Major Ralph R. Taylor
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Dimples 83
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Weather reconnaissance (Nagasaki)
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Colonel Paul W. Tibbets
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Dimples 82
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Weapon Delivery
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Major Charles W. Sweeney
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Dimples 89
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Blast measurement instrumentation
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Captain. George W. Marquardt
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Dimples 91
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Strike observation and photography
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Captain Charles F. McKnight
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Dimples 72
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Strike spare—did not complete mission
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After leaving Tinian the aircraft made their way separately to Iwo Jimawhere they rendezvoused at 2,440 meters (8,010 ft) and set course for Japan. The aircraft arrived over the target in clear visibility at 9,855 meters (32,333 ft). Parsons, who was in command of the mission, armed the bomb during the flight to minimize the risks during takeoff. His assistant, Second Lieutenant Morris Jeppson, removed the safety devices 30 minutes before reaching the target area.[61]
About an hour before the bombing, Japanese early warning radar detected the approach of some American aircraft headed for the southern part of Japan. An alert was given and radio broadcasting stopped in many cities, among them Hiroshima. At nearly 08:00, the radar operator in Hiroshima determined that the number of planes coming in was very small—probably not more than three—and the air raid alert was lifted. To conserve fuel and aircraft, the Japanese had decided not to intercept small formations. Hiroshima's anti-aircraft batteries were put on alert, but held their fire; because anti-aircraft guns caused significant collateral damage and casualties on the ground, the anti-aircraft gunners of all belligerents in the war were typically ordered to avoid firing on small numbers of enemy aircraft, especially if they were stationed in or near large population centers.[citation needed]
The normal radio broadcast warning was given to the people that it might be advisable to go to air-raid shelters if B-29s were actually sighted. However a reconnaissance mission was assumed because at 07:31 the first B29 to fly over Hiroshima at 32,000 feet (9,800 m) had been the weather observation aircraft Straight Flush that sent a Morse code message to the Enola Gay indicating that the weather was good over the primary target. Because it then turned out to sea, the 'all clear' was sounded in the city. At 08:09 Colonel Tibbets started his bomb run and handed control over to his bombardier.[62]
The release at 08:15 (Hiroshima time) went as planned, and the gravity bomb known as "Little Boy", a gun-type fission weapon with about 64 kilograms (140 lb) of uranium-235, took 43 seconds to fall from the aircraft flying at 31,060 feet (9,470 m) to the predetermined detonation height about 1,968 feet (600 m) above the city. The Enola Gay traveled 11.5 miles (18.5 km) before it felt the shock waves from the blast.[63]
Due to crosswind, it missed the aiming point, the Aioi Bridge, by approximately 800 feet (240 m) and detonated directly over Shima Surgical Clinic.[64] It created a blast equivalent to 16 kilotons of TNT (67 TJ).[65] (The U-235 weapon was considered very inefficient, with only 1.7% of its material fissioning.)[66] The radius of total destruction was about one mile (1.6 km), with resulting fires across 4.4 square miles (11 km2).[67] Americans estimated that 4.7 square miles (12 km2) of the city were destroyed. Japanese officials determined that 69% of Hiroshima's buildings were destroyed and another 6–7% damaged.[68]
Some 70,000–80,000 people, or some 30% of the population of Hiroshima were killed by the blast and resultant firestorm,[69] and another 70,000 injured.[70] Over 90% of the doctors and 93% of the nurses in Hiroshima were killed or injured—most had been in the downtown area which received the greatest damage.[71]
Japanese realization of the bombing
The Tokyo control operator of the Broadcasting Corporation of Japannoticed that the Hiroshima station had gone off the air. He tried to re-establish his program by using another telephone line, but it too had failed.[72]About 20 minutes later the Tokyo railroad telegraph center realized that the main line telegraph had stopped working just north of Hiroshima. From some small railway stops within 16 kilometres (9.9 mi) of the city came unofficial and confused reports of a terrible explosion in Hiroshima. All these reports were transmitted to the headquarters of the Imperial Japanese Army General Staff.
Military bases repeatedly tried to call the Army Control Station in Hiroshima. The complete silence from that city puzzled the men at headquarters; they knew that no large enemy raid had occurred and that no sizable store of explosives was in Hiroshima at that time. A young officer of the Japanese General Staff was instructed to fly immediately to Hiroshima, to land, survey the damage, and return to Tokyo with reliable information for the staff. It was generally felt at headquarters that nothing serious had taken place and that the explosion was just a rumor.[citation needed]
The staff officer went to the airport and took off for the southwest. After flying for about three hours, while still nearly 160 kilometres (99 mi) from Hiroshima, he and his pilot saw a great cloud of smoke from the bomb. In the bright afternoon, the remains of Hiroshima were burning. Their plane soon reached the city, around which they circled in disbelief. A great scar on the land still burning and covered by a heavy cloud of smoke was all that was left. They landed south of the city, and the staff officer, after reporting to Tokyo, immediately began to organize relief measures.[citation needed]
By 8 August 1945, newspapers in the US were reporting that broadcasts from Radio Tokyo had described the destruction observed in Hiroshima. "Practically all living things, human and animal, were literally seared to death", Japanese radio announcers said in a broadcast received by Allied sources.[73]
Post-attack casualties
According to the US Department of Energy the immediate effects of the blast killed approximately 70,000 people in Hiroshima.[74]Estimates of total deaths by the end of 1945 from burns, radiation and related disease, the effects of which were aggravated by lack of medical resources, range from 90,000 to 166,000.[1][75] Some estimates state up to 200,000 had died by 1950, due to cancer and other long-term effects.[76] Another study states that from 1950 to 2000, 46% of leukemia deaths and 11% of solid cancer deaths among bomb survivors were due to radiation from the bombs, the statistical excess being estimated to 200 leukemia and 1700 solid cancers.[77]At least eleven known prisoners of war died from the bombing.[78]
Survival of some structures
Some of the reinforced concrete buildings in Hiroshima had been very strongly constructed because of the earthquake danger in Japan, and their framework did not collapse even though they were fairly close to the blast center. Eizo Nomura (野村 英三 Nomura Eizō) was the closest known survivor, who was in the basement of a reinforced concrete building (it remained as the Rest House after the war) only 170 m (560 ft) from ground zero (the hypocenter) at the time of the attack.[79][80] Akiko Takakura (高蔵 信子Takakura Akiko) was among the closest survivors to the hypocenter of the blast. She had been in the solidly built Bank of Hiroshima only 300 meters (980 ft) from ground-zero at the time of the attack.[81] Since the bomb detonated in the air, the blast was directed more downward than sideways, which was largely responsible for the survival of the Prefectural Industrial Promotional Hall, now commonly known as the Genbaku, or A-bomb Dome. This building was designed and built by the Czech architect Jan Letzel, and was only 150 m (490 ft) from ground zero. The ruin was named Hiroshima Peace Memorial and was made a UNESCO World Heritage site in 1996 over the objections of the United States and China, which expressed reservations on the grounds that other Asian nations were the ones who suffered the greatest loss of life and property, and a focus on Japan lacked historical perspective.[82]
Hiroshima bombing
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Events of 7–9 August
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After the Hiroshima bombing, Truman issued a statement announcing the use of the new weapon. He stated, "We may be grateful to Providence" that the German atomic bomb project had failed, and that the United States and its allies had "spent two billion dollars on the greatest scientific gamble in history—and won." Truman then warned Japan:
If they do not now accept our terms, they may expect a rain of ruin from the air, the like of which has never been seen on this earth. Behind this air attack will follow sea and land forces in such numbers and power as they have not yet seen and with the fighting skill of which they are already well aware.[83]
The Japanese government still did not react to the Potsdam Declaration. Emperor Hirohito, the government, and the war council were considering four conditions for surrender: the preservation of the kokutai (Imperial institution and national polity), assumption by the Imperial Headquarters of responsibility for disarmament and demobilization, no occupation of the Japanese Home Islands, Korea, or Formosa, and delegation of the punishment of war criminals to the Japanese government.[84]
The Soviet Foreign Minister Vyacheslav Molotov had informed Tokyo of the Soviet Union's unilateral abrogation of the Soviet–Japanese Neutrality Pact on 5 April. At two minutes past midnight on 9 August, Tokyo time, Soviet infantry, armor, and air forces had launched the Manchurian Strategic Offensive Operation. Four hours later, word reached Tokyo that the Soviet Union had declared war on Japan. The senior leadership of the Japanese Army began preparations to impose martial law on the nation, with the support of Minister of War Korechika Anami, in order to stop anyone attempting to make peace.
Nagasaki
I realize the tragic significance of the atomic bomb... It is an awful responsibility which has come to us... We thank God that it has come to us, instead of to our enemies; and we pray that He may guide us to use it in His ways and for His purposes.
Nagasaki during World War II
In contrast to many modern aspects of Hiroshima, almost all of the buildings were of old-fashioned Japanese construction, consisting of wood or wood-frame buildings with wood walls (with or without plaster) and tile roofs. Many of the smaller industries and business establishments were also situated in buildings of wood or other materials not designed to withstand explosions. Nagasaki had been permitted to grow for many years without conforming to any definite city zoning plan; residences were erected adjacent to factory buildings and to each other almost as closely as possible throughout the entire industrial valley.
Nagasaki had never been subjected to large-scale bombing prior to the explosion of a nuclear weapon there. On August 1, 1945, however, a number of conventional high-explosive bombs were dropped on the city. A few hit in the shipyards and dock areas in the southwest portion of the city, several hit the Mitsubishi Steel and Arms Works, and six bombs landed at the Nagasaki Medical School and Hospital, with three direct hits on buildings there. While the damage from these bombs was relatively small, it created considerable concern in Nagasaki and many people—principally school children—were evacuated to rural areas for safety, thus reducing the population in the city at the time of the nuclear attack. By early August the city was defended by four batteries of 7 centimetres (2.8 in) anti-aircraft guns and two searchlight batteries.[57]
To the north of Nagasaki there was a camp holding British Commonwealth prisoners of war, some of whom were working in the coal mines and only found out about the bombing when they came to the surface.
The bombing
Responsibility for the timing of the second bombing was delegated to Tibbets. Scheduled for 11 August against Kokura, the raid was moved earlier by two days to avoid a five day period of bad weather forecast to begin on 10 August.[86] Three bomb pre-assemblies had been transported to Tinian, labeled F-31, F-32, and F-33 on their exteriors. On 8 August, a dress rehearsal was conducted off Tinian by Sweeney using Bockscar as the drop airplane. Assembly F-33 was expended testing the components and F-31 was designated for the August 9 mission.[87]
Aircraft
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Pilot
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Call Sign
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Mission role
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Captain George W. Marquardt
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Dimples 82
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Weather reconnaissance (Kokura)
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Captain Charles F. McKnight
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Dimples 95
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Weather reconnaissance (Nagasaki)
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Major Charles W. Sweeney
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Dimples 77
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Weapon Delivery
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Captain Frederick C. Bock
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Dimples 89
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Blast measurement instrumentation
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Major James I. Hopkins, Jr.
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Dimples 90
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Strike observation and photography
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Major Ralph R. Taylor
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Dimples 83
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Strike spare—did not complete mission
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On the morning of 9 August 1945, the B-29 Superfortress Bockscar, flown by Sweeney's crew, carried Fat Man, with Kokura as the primary target and Nagasaki the secondary target. The mission plan for the second attack was nearly identical to that of the Hiroshima mission, with two B-29s flying an hour ahead as weather scouts and two additional B-29s in Sweeney's flight for instrumentation and photographic support of the mission. Sweeney took off with his weapon already armed but with the electrical safety plugs still engaged.[89]
This time Penney and Cheshire were allowed to accompany the mission, flying as observers on the third plane,Big Stink, which was flown by the group's Operations Officer, Major James I. Hopkins, Jr. Observers aboard the weather planes reported both targets clear. When Sweeney's aircraft arrived at the assembly point for his flight off the coast of Japan, Big Stink failed to make the rendezvous. Bockscar and the instrumentation plane circled for 40 minutes without locating Hopkins. Already 30 minutes behind schedule, Sweeney decided to fly on without Hopkins.[89]
By the time they reached Kokura a half hour later, a 70% cloud cover had obscured the city, inhibiting the visual attack required by orders. After three runs over the city, and with fuel running low because a transfer pump on a reserve tank had failed before take-off, they headed for their secondary target, Nagasaki.[89] Fuel consumption calculations made en route indicated that Bockscar had insufficient fuel to reach Iwo Jima and would be forced to divert to Okinawa. After initially deciding that if Nagasaki were obscured on their arrival the crew would carry the bomb to Okinawa and dispose of it in the ocean if necessary, the weaponeer, Navy Commander Frederick Ashworth, decided that a radar approach would be used if the target was obscured.[90]
At about 07:50 Japanese time, an air raid alert was sounded in Nagasaki, but the "all clear" signal was given at 08:30. When only two B-29 Superfortresses were sighted at 10:53, the Japanese apparently assumed that the planes were only on reconnaissance and no further alarm was given.
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A few minutes later at 11:00, The Great Artiste, the support B-29 flown by Captain Frederick C. Bock, dropped instruments attached to three parachutes. These instruments also contained an unsigned letter to Professor Ryokichi Sagane, a nuclear physicist at the University of Tokyo who studied with three of the scientists responsible for the atomic bomb at the University of California, Berkeley, urging him to tell the public about the danger involved with these weapons of mass destruction. The messages were found by military authorities but not turned over to Sagane until a month later.[91] In 1949, one of the authors of the letter, Luis Alvarez, met with Sagane and signed the document.[92]
At 11:01, a last minute break in the clouds over Nagasaki allowedBockscar's bombardier, Captain Kermit Beahan, to visually sight the target as ordered. The Fat Man weapon, containing a core of about 6.4 kilograms (14 lb) of plutonium, was dropped over the city's industrial valley. It exploded 43 seconds later at 469 metres (1,539 ft) above the ground halfway between the Mitsubishi Steel and Arms Works in the south and the Mitsubishi-Urakami Ordnance Works (Torpedo Works) in the north. This was nearly 3 kilometres (1.9 mi) northwest of the planned hypocenter; the blast was confined to the Urakami Valley and a major portion of the city was protected by the intervening hills.[93] The resulting explosion had a blast yield equivalent to 21 kilotons of TNT (88 TJ).[94] The explosion generated heat estimated at 3,900 °C (7,050 °F) and winds that were estimated at 1,005 km/h (624 mph).
Casualty estimates for immediate deaths range from 40,000 to 75,000.[95][96][97] Total deaths by the end of 1945 may have reached 80,000.[1] At least eight known POWs died from the bombing and as many as 13 POWs may have died, including a British Commonwealth citizen,[98] and seven Dutch POWs.[99] One American POW, Joe Kieyoomia, was in Nagasaki at the time of the bombing but survived, reportedly having been shielded from the effects of the bomb by the concrete walls of his cell.[100] The radius of total destruction was about 1 mile (1.6 km), followed by fires across the northern portion of the city to 2 miles (3.2 km) south of the bomb.[101][102]The Mitsubishi-Urakami Ordnance Works, the factory that manufactured the type 91 torpedoes released in theattack on Pearl Harbor, was destroyed in the blast.[103] There is also a peace monument and Bell of Nagasaki in the Kokura.[104]
Bombing of Nagasaki
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Plans for more atomic attacks on Japan
Groves expected to have another atomic bomb ready for use on 19 August, with three more in September and a further three in October.[105] On 10 August, he sent a memorandum to Marshall in which he wrote that "the next bomb . . should be ready for delivery on the first suitable weather after 17 or 18 August." On the same day, Marshall endorsed the memo with the comment, "It is not to be released over Japan without express authority from the President."[105]
There was already discussion in the War Department about conserving the bombs in production until Operation Downfall had begun. "The problem now [13 August] is whether or not, assuming the Japanese do not capitulate, to continue dropping them every time one is made and shipped out there or whether to hold them . . . and then pour them all on in a reasonably short time. Not all in one day, but over a short period. And that also takes into consideration the target that we are after. In other words, should we not concentrate on targets that will be of the greatest assistance to an invasion rather than industry, morale, psychology, and the like? Nearer the tactical use rather than other use."[105]
Two more Fat Man assemblies were readied. The third core was scheduled to leave Kirtland Field for Tinian on 12 August,[106] and Tibbets was ordered by Major General Curtis LeMay to return to Utah to collect it.[107] Robert Bacher was packaging it in Los Alamos when he received word from Groves that the shipment was suspended.[108]
Surrender of Japan and subsequent occupation
Until 9 August the war council had still insisted on its four conditions for surrender. On that day Hirohito orderedKido to "quickly control the situation ... because the Soviet Union has declared war against us." He then held an Imperial conference during which he authorized minister Tōgō to notify the Allies that Japan would accept their terms on one condition, that the declaration "does not compromise any demand which prejudices the prerogatives of His Majesty as a Sovereign ruler."[109]
On 10 August the Japanese government presented a letter of protest for the atomic bombings to the government of the United States via the government of Switzerland.[110] On 12 August the Emperor informed the imperial family of his decision to surrender. One of his uncles, Prince Asaka, then asked whether the war would be continued if the kokutai could not be preserved. Hirohito simply replied "Of course."[111] As the Allied terms seemed to leave intact the principle of the preservation of the Throne, Hirohito recorded on 14 August hiscapitulation announcement which was broadcast to the Japanese nation the next day despite a short rebellion by militarists opposed to the surrender.
In his declaration, Hirohito referred to the atomic bombings:
Moreover, the enemy now possesses a new and terrible weapon with the power to destroy many innocent lives and do incalculable damage. Should we continue to fight, not only would it result in an ultimate collapse and obliteration of the Japanese nation, but also it would lead to the total extinction of human civilization. Such being the case, how are We to save the millions of Our subjects, or to atone Ourselves before the hallowed spirits of Our Imperial Ancestors? This is the reason why We have ordered the acceptance of the provisions of the Joint Declaration of the Powers.
In his "Rescript to the soldiers and sailors" delivered on 17 August, he stressed the impact of the Soviet invasion and his decision to surrender, omitting any mention of the bombs.
During the year after the bombing, approximately 40,000 US troops occupied Hiroshima, while Nagasaki was occupied by 27,000 troops.
Depiction, public response and censorship
During the war "annihilationist and exterminationalist rhetoric" was tolerated at all levels of US society; according to the UK embassy in Washington the Americans regarded the Japanese as "a nameless mass of vermin".[112] Caricatures depicting Japanese as less than human, e.g. monkeys, were common.[112] A 1944 opinion poll that asked what should be done with Japan found that 13% of the US public were in favor of "killing off" all Japanese: men, women, and children.[113][114]
News of the atomic bombing was greeted enthusiastically in the US; a poll in Fortune magazine in late 1945 showed a significant minority of Americans wishing that more atomic bombs could have been dropped on Japan.[115] The initial positive response was supported by the imagery presented to the public (mainly the powerful mushroom cloud) and the censorship of photographs that showed corpses of people incinerated by the blast as well as photos of maimed survivors.[115]Wilfred Burchett was the first journalist to visit Hiroshima after the atom bomb was dropped, arriving alone by train from Tokyo on 2 September, the day of the formal surrender aboard the USS Missouri. His Morse code dispatch was printed by the Daily Express newspaper in London on 5 September 1945, entitled "The Atomic Plague", the first public report to mention the effects of radiation and nuclear fallout. His report is more fully recorded in his book, Shadow of Hiroshima.[116]
Burchett's reporting was unpopular with the U.S. military. U.S. censors killed a supporting story submitted by George Weller of the Chicago Daily News, and accused Burchett of being under the sway of Japanese propaganda. William L. Laurence of The New York Timesdismissed the reports on radiation sickness as Japanese efforts to undermine American morale, ignoring his own account of Hiroshima's radiation sickness published one week earlier.[117] During the U.S. occupation of Japan, and under General MacArthur's orders, Burchett was for a time barred entrance to Japan. [118] A member of the US Strategic Bombing Survey, Lieutenant Daniel McGovern, used a film crew to document the results. The film crew's work resulted in a three-hour documentary entitled The Effects of the Atomic Bombs Against Hiroshima and Nagasaki. The documentary included images from hospitals showing the human effects of the bomb; it showed burned out buildings and cars, and rows of skulls and bones on the ground. When sent to the US, it was mentioned widely in the US press, then quietly suppressed and never shown. It was classified "top secret" for the next 22 years.[119] During this time in America, it was a common practice for editors to keep graphic images of death out of films, magazines, and newspapers.[120][121] The total of 90,000 feet (27,000 m) of footage filmed by Lieutenant Daniel McGovern's cameramen had not been fully aired As of 2009. However, according to Greg Mitchell, with the 2004 documentary film Original Child Bomb, a small part of that footage managed to reach part of the American public "in the unflinching and powerful form its creators intended".[122]
Imagery of the atomic bombings was suppressed in Japan during the occupation[123] although some Japanese magazines had managed to publish images before the Allied occupation troops took control. The Allied occupation forces enforced censorship on anything "that might, directly or by inference, disturb public tranquility", and pictures of the effects on people on the ground were deemed inflammatory. A likely reason for the banning was that the images depicting burn victims and funeral pyres were similar to the widely circulated images taken in liberated Nazi concentration camps.[124]
Motion picture company Nippon Eigasha started sending cameramen to Nagasaki and Hiroshima in September 1945. On 24 October 1945 a US military policeman stopped a Nippon Eigasha cameraman from continuing to film in Nagasaki. All Nippon Eigasha's reels were then confiscated by the American authorities. These reels were in turn requested by the Japanese government, declassified, and saved from oblivion. Some black-and-white motion pictures were released and shown for the first time to Japanese and American audiences in the years from 1968 to 1970.[122]
Atomic Bomb Casualty Commission
In the spring of 1948, the Atomic Bomb Casualty Commission (ABCC) was established in accordance with a presidential directive from Harry S. Truman to the National Academy of Sciences–National Research Council to conduct investigations of the late effects of radiation among the survivors in Hiroshima and Nagasaki.
Among the casualties were found many unintended victims, including Allied POWs,[125] Korean and Chinese laborers, students from Malaya on scholarships, and some 3,200 Japanese American citizens.[126]
One of the early studies conducted by the ABCC was on the outcome of pregnancies occurring in Hiroshima and Nagasaki, and in a control city, Kure located 18 miles (29 km) south from Hiroshima, in order to discern the conditions and outcomes related to radiation exposure. One author has claimed that the ABCC refused to provide medical treatment to the survivors for better research results.[127] In 1975, the Radiation Effects Research Foundation was created to assume the responsibilities of ABCC.[128]
Hibakusha
Main article: Hibakusha
The survivors of the bombings are called hibakusha (被爆者), a Japanese word that literally translates to "explosion-affected people." As of 31 March 2012, 210,830 hibakusha were recognized by the Japanese government, most living in Japan.[129] The government of Japan recognizes about 1% of these as having illnesses caused by radiation.[130] The memorials in Hiroshima and Nagasaki contain lists of the names of thehibakusha who are known to have died since the bombings. Updated annually on the anniversaries of the bombings, as of August 2012 the memorials record the names of almost 440,000 deceased hibakusha; 280,959 in Hiroshima[131] and 158,754 in Nagasaki.[132]
Double survivors
People who suffered the effects of both bombings are known as nijū hibakusha in Japan. On 24 March 2009, the Japanese government officially recognized Tsutomu Yamaguchi (1916–2010) as a double hibakusha. He was confirmed to be 3 kilometres (1.9 mi) from ground zero in Hiroshima on a business trip when Little Boy was detonated. He was seriously burnt on his left side and spent the night in Hiroshima. He arrived at his home city of Nagasaki on 8 August, the day before Fat Man was dropped, and he was exposed to residual radiation while searching for his relatives. He was the first officially recognised survivor of both bombings.[133] He died on 4 January 2010, at the age of 93, after a battle with stomach cancer.[134] The 2006 documentary Twice Survived: The Doubly Atomic Bombed of Hiroshima and Nagasaki documented 165 nijū hibakusha, and was screened at the United Nations.[135]
Korean survivors
During the war, Japan brought as many as 670,000 Korean conscripts to Japan to work as forced labor.[136]About 20,000 Koreans were killed in Hiroshima and another 2,000 died in Nagasaki. Perhaps one in seven of the Hiroshima victims was of Korean ancestry. A Korean prince of the Joseon Dynasty, Yi Wu, died from the Hiroshima bombing.[137] For many years, Koreans had a difficult time fighting for recognition as atomic bomb victims and were denied health benefits. However, most issues have been addressed in recent years through lawsuits.[138]
Debate over bombings
The atomic bomb was more than a weapon of terrible destruction; it was a psychological weapon.
The role of the bombings in Japan's surrender and the US's ethical justification for them has been the subject of scholarly and popular debate for decades. J. Samuel Walker wrote in an April 2005 overview of recent historiography on the issue, "the controversy over the use of the bomb seems certain to continue." He wrote that "The fundamental issue that has divided scholars over a period of nearly four decades is whether the use of the bomb was necessary to achieve victory in the war in the Pacific on terms satisfactory to the United States."[140]
Supporters of the bombings generally assert that they caused the Japanese surrender, preventing massive casualties on both sides in the planned invasion of Japan. One figure of speech, "One hundred million [subjects of the Japanese Empire] will die for the Emperor and Nation,"[141] served as a unifying slogan. Although some Japanese were taken prisoner,[142] most fought until they were killed or committed suicide.[143] Nearly 99% of the 21,000 defenders of Iwo Jima were killed,[142] and the last Japanese soldiers did not surrender until November 1949.[144]Of the 117,000 Japanese troops defending Okinawa in April–June 1945, 94% were killed.[142] Supporters also point to an order given by the Japanese War Ministry on 1 August 1944, ordering the execution of Allied prisoners of war when the POW-camp was in the combat zone, so "escapees from the camp may turn into a hostile fighting force".[145] As War Minister, Korechika Anami was opposed to the surrender. Immediately after Hiroshima, he commented, "I am convinced that the Americans had only one bomb, after all."[146] Eventually, Anami's arguments were overcome when Emperor Hirohito directly requested an end to the war himself.[147]
Those who oppose the bombings, among them many US military leaders as well as ex-president Herbert Hoover, argue that it was simply an extension of the already fierce conventional bombing campaign.[148] This, together with the sea blockade and the collapse of Germany (with its implications regarding redeployment), would also have led to a Japanese surrender – so the atomic bombings were militarily unnecessary. On the contrary, according to Kyoko Iriye Selden, "The most influential text is Truman's 1955 Memoirs, which states that the atomic bomb probably saved half a million US lives— anticipated casualties in an Allied invasion of Japan planned for November. Stimson subsequently talked of saving one million US casualties, and Churchill of saving one million American and half that number of British lives."[149]
Scholars have pointed out various alternatives that could have ended the war just as quickly without an invasion, but these alternatives could have resulted in the deaths of many more Japanese.[150]
As the United States dropped its atomic bombs on Hiroshima and Nagasaki in August 1945, 1.6 million Soviet troops launched a surprise attack on the Japanese forces occupying eastern Asia. "The Soviet entry into the war played a much greater role than the atomic bombs in inducing Japan to surrender because it dashed any hope that Japan could terminate the war through Moscow's mediation", said Japanese historian Tsuyoshi Hasegawa, whose recently published Racing the Enemy: Stalin, Truman, and the Surrender of Japan is based on recently declassified Soviet archives as well as US and Japanese documents.[151]
Legal situation in Japan
Main article: Ryuichi Shimoda v. The State
... (b) that the dropping of atomic bombs as an act of hostilities was illegal under the rules of positive international law (taking both treaty law and customary law into consideration) then in force... (c) that the dropping of atomic bombs also constituted a wrongful act on the plane of municipal law, ascribable to the United States and its President, Mr. Harry S. Truman; ...The aerial bombardment with atomic bombs of the cities of Hiroshima and Nagasaki was an illegal act of hostilities according to the rules of international law. It must be regarded as indiscriminate aerial bombardment of undefended cities, even if it were directed at military objectives only, inasmuch as it resulted in damage comparable to that caused by indiscriminate bombardment.
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