The first firestorm to consume Hiroshima came not in August, but on a freezing March night when 121 bombers rehearsed the city's destruction.

The Forgotten Firebombing: When American B-29s Erased Hiroshima—Before the Bomb

On March 1, 1945, 121 Superfortresses turned a Japanese city into kindling

Five months before the atomic bomb, American B-29s firebombed Hiroshima—and its partial survival made it a target for nuclear annihilation.

The sirens wailed across Hiroshima at 3:47 AM on March 1, 1945, but most residents had grown numb to false alarms. This time was different. High above the Seto Inland Sea, 121 Boeing B-29 Superfortresses of the XXI Bomber Command droned through the darkness, their bomb bays pregnant with incendiary clusters.

Major General Curtis LeMay had just revolutionized Pacific air warfare. Abandoning high-altitude precision bombing, he ordered his crews to fly at barely 5,000 feet, strip their planes of defensive guns, and carry nothing but fire. The first test had come two weeks earlier over Tokyo. Now Hiroshima would taste the same medicine.

At 4:12 AM, pathfinder aircraft dropped magnesium flares that turned night into sickly daylight. Then came the M-69 incendiary bombs—six-pound cylinders filled with jellied gasoline that burst on impact, spraying fire across wooden machiya houses. Within twenty minutes, the Nakahiro-machi district was a howling inferno.

Sachiko Tanaka, then a seventeen-year-old factory worker, later recalled the chaos to researchers from the Hiroshima Peace Memorial Museum: "The sky turned orange, then white. My neighbor's roof exploded into flames without warning. W…

💡 The March 1 raid's limited damage actually sealed Hiroshima's fate: American planners specifically chose cities that remained relatively intact to clearly measure the atomic bomb's destructive power.