Humanities › History & Culture The Atomic Bombing of Hiroshima and Nagasaki Share Flipboard Email Print Mark Stevenson / Stocktrek Images / Getty Images History & Culture Military History World War II Battles & Wars Key Figures Arms & Weapons Naval Battles & Warships Aerial Battles & Aircraft Civil War French Revolution Vietnam War World War I American History African American History African History Ancient History and Culture Asian History European History Genealogy Inventions Latin American History Medieval & Renaissance History The 20th Century Women's History View More By Jennifer Rosenberg History Expert B.A., History, University of California at Davis Jennifer Rosenberg is a historian and writer who specializes in 20th-century history. our editorial process Jennifer Rosenberg Updated July 26, 2019 Attempting to bring an earlier end to World War II, U.S. President Harry Truman made the fateful decision to drop a massive atomic bomb on the Japanese city of Hiroshima. On August 6, 1945, this atomic bomb, known as "Little Boy," flattened the city, killing at least 70,000 people that day and tens of thousands more from radiation poisoning. While Japan was still trying to comprehend this devastation, the United States dropped another atomic bomb. This bomb, nicknamed "Fat Man," was dropped on the Japanese city of Nagasaki, killing an estimated 40,000 people immediately and another 20,000 to 40,000 in the months following the explosion. On August 15, 1945, Japanese Emperor Hirohito announced an unconditional surrender, ending World War II. The Enola Gay Heads to Hiroshima At 2:45 a.m. on Monday, August 6, 1945, a B-29 bomber took off from Tinian, a North Pacific island in the Marianas, 1,500 miles south of Japan. The 12-man crew was on board to make sure this secret mission went smoothly. Colonel Paul Tibbets, the pilot, nicknamed the B-29 the "Enola Gay" after his mother. Just before take-off, the plane's nickname was painted on its side. The Enola Gay was a B-29 Superfortress (aircraft 44-86292), part of the 509th Composite Group. In order to carry such a heavy load as an atomic bomb, the Enola Gay was modified: new propellers, stronger engines, and faster opening bomb bay doors. (Only 15 B-29s underwent this modification.) Even though it had been modified, the plane still had to use the full runway to gain the necessary speed, thus it did not lift off until very near the water's edge.1 The Enola Gay was escorted by two other bombers that carried cameras and a variety of measuring devices. Three other planes had left earlier in order to ascertain the weather conditions over the possible targets. The Atomic Bomb Known as Little Boy Is on Board On a hook in the ceiling of the plane, hung the ten-foot atomic bomb, "Little Boy." Navy Captain William S. Parsons ("Deak"), chief of the Ordnance Division in the "Manhattan Project," was the Enola Gay's weaponeer. Since Parsons had been instrumental in the development of the bomb, he was now responsible for arming the bomb while in-flight. Approximately 15 minutes into the flight (3:00 a.m.), Parsons began to arm the atomic bomb; it took him 15 minutes. Parsons thought while arming "Little Boy": "I knew the Japs were in for it, but I felt no particular emotion about it."2 "Little Boy" was created using uranium-235, a radioactive isotope of uranium. This uranium-235 atomic bomb, a product of $2 billion of research, had never been tested. Nor had any atomic bomb yet been dropped from a plane. Some scientists and politicians pushed for not warning Japan of the bombing in order to save face in case the bomb malfunctioned. Clear Weather Over Hiroshima There had been four cities chosen as possible targets: Hiroshima, Kokura, Nagasaki, and Niigata (Kyoto was the first choice until it was removed from the list by Secretary of War Henry L. Stimson). The cities were chosen because they had been relatively untouched during the war. The Target Committee wanted the first bomb to be "sufficiently spectacular for the importance of the weapon to be internationally recognized when publicity on it was released."3 On August 6, 1945, the first choice target, Hiroshima, was having clear weather. At 8:15 a.m. (local time), the Enola Gay's door sprang open and dropped "Little Boy." The bomb exploded 1,900 feet above the city and only missed the target, the Aioi Bridge, by approximately 800 feet. The Explosion at Hiroshima Staff Sergeant George Caron, the tail gunner, described what he saw: "The mushroom cloud itself was a spectacular sight, a bubbling mass of purple-gray smoke and you could see it had a red core in it and everything was burning inside. . . . It looked like lava or molasses covering a whole city. . . ."4 The cloud is estimated to have reached a height of 40,000 feet. Captain Robert Lewis, the co-pilot, stated, "Where we had seen a clear city two minutes before, we could no longer see the city. We could see smoke and fires creeping up the sides of the mountains."5 Two-thirds of Hiroshima was destroyed. Within three miles of the explosion, 60,000 of the 90,000 buildings were demolished. Clay roof tiles had melted together. Shadows had imprinted on buildings and other hard surfaces. Metal and stone had melted. Unlike other bombing raids, the goal for this raid had not been a military installation but rather an entire city. The atomic bomb that exploded over Hiroshima killed civilian women and children in addition to soldiers. Hiroshima's population has been estimated at 350,000; approximately 70,000 died immediately from the explosion and another 70,000 died from radiation within five years. A survivor described the damage to people: The appearance of people was . . . well, they all had skin blackened by burns. . . . They had no hair because their hair was burned, and at a glance you couldn't tell whether you were looking at them from in front or in back. . . . They held their arms bent [forward] like this . . . and their skin - not only on their hands, but on their faces and bodies too - hung down. . . . If there had been only one or two such people . . . perhaps I would not have had such a strong impression. But wherever I walked I met these people. . . . Many of them died along the road - I can still picture them in my mind -- like walking ghosts. 6 The Atomic Bombing of Nagasaki While the people of Japan tried to comprehend the devastation in Hiroshima, the United States was preparing a second bombing mission. The second run was not delayed in order to give Japan time to surrender but was waiting only for a sufficient amount of plutonium-239 for the atomic bomb. On August 9, 1945, only three days after the bombing of Hiroshima, another B-29, Bock's Car, left Tinian at 3:49 a.m. The first choice target for this bombing run had been Kokura. Since the haze over Kokura prevented the sighting of the bombing target, Bock's Car continued on to its second target. At 11:02 a.m., the atomic bomb, "Fat Man," was dropped over Nagasaki. The atomic bomb exploded 1,650 feet above the city. Fujie Urata Matsumoto, a survivor, shares one scene: The pumpkin field in front of the house was blown clean. Nothing was left of the whole thick crop, except that in place of the pumpkins there was a woman's head. I looked at the face to see if I knew her. It was a woman of about forty. She must have been from another part of town -- I had never seen her around here. A gold tooth gleamed in the wide-open mouth. A handful of singed hair hung down from the left temple over her cheek, dangling in her mouth. Her eyelids were drawn up, showing black holes where the eyes had been burned out. . . . She had probably looked square into the flash and gotten her eyeballs burned. Approximately 40 percent of Nagasaki was destroyed. Luckily for many civilians living in Nagasaki, though this atomic bomb was considered much stronger than the one exploded over Hiroshima, the terrain of Nagasaki prevented the bomb from doing as much damage. The decimation, however, was still great. With a population of 270,000, approximately 40,000 people died immediately and another 30,000 by the end of the year. I saw the atom bomb. I was four then. I remember the cicadas chirping. The atom bomb was the last thing that happened in the war and no more bad things have happened since then, but I don't have my Mummy any more. So even if it isn't bad any more, I'm not happy.--- Kayano Nagai, survivor 8 Sources Notes 1. Dan Kurzman, Day of the Bomb: Countdown to Hiroshima (New York: McGraw-Hill Book Company, 1986) 410.2. William S. Parsons as quoted in Ronald Takaki, Hiroshima: Why America Dropped the Atomic Bomb (New York: Little, Brown and Company, 1995) 43.3. Kurzman, Day of the Bomb 394.4. George Caron as quoted in Takaki, Hiroshima 44.5. Robert Lewis as quoted in Takaki, Hiroshima 43.6. A survivor quoted in Robert Jay Lifton, Death in Life: Survivors of Hiroshima (New York: Random House, 1967) 27.7. Fujie Urata Matsumoto as quoted in Takashi Nagai, We of Nagasaki: The Story of Survivors in an Atomic Wasteland (New York: Duell, Sloan and Pearce, 1964) 42.8. Kayano Nagai as quoted in Nagai, We of Nagasaki 6. Bibliography Hersey, John. Hiroshima. New York: Alfred A. Knopf, 1985. Kurzman, Dan. Day of the Bomb: Countdown to Hiroshima. New York: McGraw-Hill Book Company, 1986. Liebow, Averill A. Encounter With Disaster: A Medical Diary of Hiroshima, 1945. New York: W. W. Norton & Company, 1970. Lifton, Robert Jay. Death in Life: Survivors of Hiroshima. New York: Random House, 1967. Nagai, Takashi. We of Nagasaki: The Story of Survivors in an Atomic Wasteland. New York: Duell, Sloan and Pearce, 1964. Takaki, Ronald. Hiroshima: Why America Dropped the Atomic Bomb. New York: Little, Brown and Company, 1995.