The Air Raids Over Japan during World War II: The History of the Allies’ Bombing Campaigns on the Japanese Mainland

“The Japanese people had been told they were invulnerable … An attack on the Japanese homeland would cause confusion in the minds of the Japanese people and sow doubt about the reliability of their leaders. There was a second, and equally important, psychological reason for this attack … Americans badly needed a morale boost.” – Jimmy Doolittle
All Americans are familiar with the “day that will live in infamy.”

At 9:30 a.m. on Sunday, December 7, 1941, Pearl Harbor, the advanced base of the United States Navy’s Pacific Fleet, was ablaze. It had been smashed by aircraft launched by the carriers of the Imperial Japanese Navy. All eight battleships had been sunk or badly damaged, 350 aircraft had been knocked out, and over 2,000 Americans lay dead. Indelible images of the USS Arizona exploding and the USS Oklahoma capsizing and floating upside down have been ingrained in the American conscience ever since. In less than an hour and a half the Japanese had almost wiped out America’s entire naval presence in the Pacific.

The Americans would turn the war in the Pacific around in the middle of 1942, but in the wake of Pearl Harbor and the Japanese invasion of the Philippines, the country was in desperate need of a morale boost, and it would come in the form of the Doolittle Raid. In part to show that the Japanese were not invincible, and in part to reassure the American public that the nation would not lose the war, the Doolittle Raid included both Army and Navy units that launched 16 land-based medium bombers from an aircraft carrier, a feat that was the first of its kind but also one involving a great deal of risk. Getting the bombers and carriers in place to execute the mission involved much strategic planning and cooperation within the American military, and had it failed, it could have dealt a serious blow to the Americans’ Pacific presence due to the nation’s limited resources in that theater.

The first serious air raids over Japan came in November 1944, after the Americans had captured the Marianas Islands, and through February 1945, American bombers concentrated on military targets at the fringes of the city, particularly air defenses. However, the air raids of March 1945, and particularly on the night of March 9, were a different story altogether. In what is generally referred to as strategic or area bombing, waves of bombers flew low over Tokyo for over two and a half hours, dropping incendiary bombs with the intention of producing a massive firestorm. The American raids intended to produce fires that would kill soldiers and civilians, as well as the munitions factories and apartment buildings of those who worked in them. 325 B-29s headed toward Tokyo, and nearly 300 of them dropped bombs on it, destroying more than 267,000 buildings and killing more than 83,000 people, making it the deadliest day of the war. Additional raids, this time largely on the north and west, came in April, and in May, raids hit Ginza and the south. Altogether, American bombers flew more than 4,000 missions over Tokyo before surrender.

While the war raged in Europe and the Pacific, a dream team of Nobel Laureates was working on the Manhattan Project in America, a program kept so secret that Vice President Harry Truman didn’t know about it until he took the presidency after Franklin D. Roosevelt’s death in April 1945. The Manhattan Project would ultimately yield the “Little Boy” and “Fat Man” bombs that released more than 100 Terajoules of energy at Hiroshima and Nagasaki. The attacks on Hiroshima and Nagasaki in August 1945, along with the Cold War-era tests and their accompanying mushroom clouds, would demonstrate the true power and terror of nuclear weapons, but in the late 1930s these bombs were only vaguely being thought through, particularly after the successful first experiment to split the atom by a German scientist.