[MoCH] Bombing of Hiroshima and Nagasaki | 広島と長崎への原爆投下

Day 2,463, 02:14 Published in Japan Japan by synhro



On August 6, 1945, during World War II (1939-45), an American B-29 bomber dropped the world’s first deployed atomic bomb over the Japanese city of Hiroshima. The explosion wiped out 90 percent of the city and immediately killed 80,000 people; tens of thousands more would later die of radiation exposure. Three days later, a second B-29 dropped another A-bomb on Nagasaki, killing an estimated 40,000 people. Japan’s Emperor Hirohito announced his country’s unconditional surrender in World War II in a radio address on August 15, citing the devastating power of “a new and most cruel bomb.”






The Manhattan Project
Even before the outbreak of war in 1939, a group of American scientists–many of them refugees from fascist regimes in Europe–became concerned with nuclear weapons research being conducted in Nazi Germany. In 1940, the U.S. government began funding its own atomic weapons development program, which came under the joint responsibility of the Office of Scientific Research and Development and the War Department after the U.S. entry into World War II. The U.S. Army Corps of Engineers was tasked with spearheading the construction of the vast facilities necessary for the top-secret program, codenamed “The Manhattan Project ” (for the engineering corps’ Manhattan district).



Over the next several years, the program’s scientists worked on producing the key materials for nuclear fission–uranium-235 and plutonium (Pu-239). They sent them to Los Alamos, New Mexico, where a team led by J. Robert Oppenheimer worked to turn these materials into a workable atomic bomb. Early on the morning of July 16, 1945, the Manhattan Project held its first successful test of an atomic device–a plutonium bomb–at the Trinity test site at Alamogordo, New Mexico.



No Surrender for the Japanese
By the time of the Trinity test, the Allied powers had already defeated Germany in Europe. Japan, however, vowed to fight to the bitter end in the Pacific, despite clear indications (as early as 1944) that they had little chance of winning. In fact, between mid-April 1945 (when President Harry Truman took office) and mid-July, Japanese forces inflicted Allied casualties totaling nearly half those suffered in three full years of war in the Pacific, proving that Japan had become even more deadly when faced with defeat. In late July, Japan’s militarist government rejected the Allied demand for surrender put forth in the Potsdam Declaration, which threatened the Japanese with “prompt and utter destruction” if they refused.



General Douglas MacArthur and other top military commanders favored continuing the conventional bombing of Japan already in effect and following up with a massive invasion, codenamed “Operation Downfall.” They advised Truman that such an invasion would result in U.S. casualties of up to 1 million. In order to avoid such a high casualty rate, Truman decided–over the moral reservations of Secretary of War Henry Stimson, General Dwight Eisenhower and a number of the Manhattan Project scientists–to use the atomic bomb in the hopes of bringing the war to a quick end. Proponents of the A-bomb–such as James Byrnes, Truman’s secretary of state–believed that its devastating power would not only end the war, but also put the U.S. in a dominant position to determine the course of the postwar world.



“Little Boy” and “Fat Man”
Hiroshima, a manufacturing center of some 350,000 people located about 500 miles from Tokyo, was selected as the first target. After arriving at the U.S. base on the Pacific island of Tinian, the more than 9,000-pound uranium-235 bomb was loaded aboard a modified B-29 bomber christened Enola Gay (after the mother of its pilot, Colonel Paul Tibbets). The plane dropped the bomb–known as “Little Boy”–by parachute at 8:15 in the morning, and it exploded 2,000 feet above Hiroshima in a blast equal to 12-15,000 tons of TNT, destroying five square miles of the city.



Hiroshima’s devastation failed to elicit immediate Japanese surrender, however, and on August 9 Major Charles Sweeney flew another B-29 bomber, Bockscar, from Tinian. Thick clouds over the primary target, the city of Kokura, drove Sweeney to a secondary target, Nagasaki, where the plutonium bomb “Fat Man” was dropped at 11:02 that morning. More powerful than the one used at Hiroshima, the bomb weighed nearly 10,000 pounds and was built to produce a 22-kiloton blast. The topography of Nagasaki, which was nestled in narrow valleys between mountains, reduced the bomb’s effect, limiting the destruction to 2.6 square miles.

At noon on August 15, 1945 (Japanese time), Emperor Hirohito announced his country’s surrender in a radio broadcast. The news spread quickly, and “Victory in Japan” or “V-J Day” celebrations broke out across the United States and other Allied nations. The formal surrender agreement was signed on September 2, aboard the U.S. aircraft carrier Missouri, anchored in Tokyo Bay.



Needless tragedy or prudent military decision?
Because of robust Japanese defenses and the topography of the islands themselves, an amphibious assault would have taken a heavy toll on U.S. forces. Military officials estimated that such an invasion might have incurred up to a million U.S. casualties, with corresponding Japanese military and civilian losses. Two fire bombing raids on Tokyo earlier in 1945 had already killed 140,000 citizens and injured a million more. The bombings of Hiroshima and Nagasaki, then, might actually have spared hundreds of thousands of Japanese and American lives.

This justification, however, is not universally accepted. Some sources' estimates of U.S. casualties are significantly lower—perhaps as low as 50,000 men. It is also not entirely clear that an unconditional Japanese surrender was impossible, especially if Russia had entered the war before the bombing (Russia officially declared war on Japan on August 8, two days after the destruction of Hiroshima).



Some suggest that Truman, fearing a Soviet attempt to dominate the postwar Asian order as it had the Eastern European, ordered the bombing to force Japan's surrender before Russia had the chance to enter the fray (and thus earn the right to affect the peace settlement). Truman may also have wanted to intimidate his potential rival Stalin with the United States' new destructive capability.

Whether the bombings of Hiroshima and Nagasaki constituted a needless tragedy or a prudent military decision will never be certain. Those who made the decision, as well as most of the survivors, are long gone. The effects, though—the lingering scourge of radiation, the memory of the ghastly civilian casualties, the psychological impact of simply knowing that such a destructive force exists—remain. One can only hope that those who now wield the tools of armageddon will remember the lessons of Hiroshima and Nagasaki for a long time to come.




Your MoCH team:
Minister of Culture & History: Nanashi Senshi
Vice Minister of Culture & History: Turt037, sto kila bazuki
History Director: sto kila bazuki
Graphics Director: Turt037