When the United States launched a bombing operation over Japan on Mar. 9, 1945, firebombing was hardly a new tactic. But the scope of the damage was unprecedented: as TIME framed it the following week, the fire in Tokyo destroyed “approximately 9,700 acres, or 15 square miles,” versus a single square mile that was destroyed by a Luftwaffe attack on London in 1940.
“This fire left nothing but twisted, tumbled-down rubble in its path,” Major General Curtis E. LeMay reported, according to TIME.
What changed?
For one thing, the firepower available to U.S. pilots was on another level. The hard-fought and ongoing battle for Iwo Jima proved worthwhile, affording the American pilots an airfield within striking distance of the enemy capital, and planes also flew in from Saipan, Tinian and Guam. The hundreds of aircraft each carried several tons of incendiaries for a combined total of about 700,000 bombs. Though Japan did have anti-aircraft defense, it was aimed thousands of feet higher than the low-flying bombers flew.
Secondly, that firepower came in a new format: the M-69. The new bomb—a pipe full of gasoline jelly enhanced by a secret ingredient that had been developed by the oil company Esso; this jelly is now better known as napalm—created fire that was hotter and harder to put out than fires created by other common incendiary materials. “Dropped in loose clusters of 14, or ‘amiable’ clusters of 38, the finless oil-bombs are exploded by a time fuse four or five seconds after landing. Thereupon M-69s become miniature flamethrowers that hurl cheesecloth socks full of furiously flaming goo for 100 yards,” TIME reported shortly after the attack. “Anything these socks hit is enveloped by clinging, fiery pancakes, each spreading to more than a yard in diameter. Individually, these can be extinguished as easily as a magnesium bomb. But a single oil-bomb cluster produces so many fiery pancakes that the problem for fire fighters, like that of a mother whose child has got loose in the jam pot, is where to begin.”
Thirdly, areas of Tokyo—and other Japanese cities that were also targets—were particularly liable to burn. Though some buildings had been reinforced with concrete after recent earthquakes, many were pre-modern constructions of flammable materials. That meant a building didn’t have to be struck to burn: a firestorm spread throughout the city,
And finally, conditions that day were favorable to the bombers, with good visibility and wind.
The fatalities from the bombing raid were, as Kirk Spitzer explained for TIME.com in 2012, on par with those caused by the atomic bombings that would come a few months later, even though historical memory of the former has faded significantly more.
World War II: Photos We Remember
In a picture that captures the violence and sheer destruction inherent in war perhaps more graphically than any other ever published in LIFE, Marines take cover on an Iwo Jima hillside amid the burned-out remains of banyan jungle, as a Japanese bunker is obliterated in March 1945.W. Eugene Smith—Time & Life Pictures/Getty ImagesIn this and dozens of other, similar pictures made at New York's Penn Station in 1944, LIFE's Alfred Eisenstaedt captured a private moment repeated in public millions of times over the course of the war: a guy, a girl, a goodbye - and no assurance that he'll make it back. By war's end, more than 400,000 American troops had been killed.Alfred Eisenstaedt—Time & Life Pictures/Getty ImagesDuring 1940's Battle of Britain, Luftwaffe bombers tried to destroy British air power ahead of a planned invasion of the UK. When that failed, Hitler resorted to terror attacks on civilians, including the full-scale bombing of London (pictured) and other English towns. The attacks killed tens of thousands of Britons, but "The Blitz" fizzled: the invasion never materialized.William Vandivert—Time & Life Pictures/Getty ImagesThree American soldiers lie half-buried in the sand at Buna Beach on New Guinea. This photo was taken in February 1943, but not published until September, when it became the first image of dead American troops to appear in LIFE during World War II. George Strock's photo was finally OK'd by government censors, in part because FDR feared the public was growing complacent about the war's horrific toll.George Strock—Time & Life Pictures/Getty ImagesThe Statue of Liberty, photographed during a blackout in 1942 - an eloquent expression of the nation's mood in the first full year of a global conflict with no real end in sight.Andreas Feininger—Time & Life Pictures/Getty ImagesMembers of the Women's Auxiliary Army Corps, commonly known as WAACs, don their first gas masks at Fort Des Moines, Iowa, in June 1942. The female troops were famously praised by General Douglas MacArthur, who called them "my best soldiers."Marie Hansen—Time & Life Pictures/Getty ImagesA photo taken by Hitler's personal photographer (and later acquired by LIFE) shows a 1939 rally in which Hitler salutes Luftwaffe troops who fought with Francisco Franco's ultra-right wing nationalist rebels in the Spanish Civil War.Hugo Jaeger—Time & Life Pictures/Getty ImagesSoldiers goose-step past the Fhrer in honor of Hitler's 50th birthday, April 20, 1939. Less than five months later, on September 1, the Third Reich's forces invaded Poland.Hugo Jaeger—Time & Life Pictures/Getty ImagesAustrians cheer Adolf Hitler during his 1938 campaign to unite Austria and Germany. In the rapt faces, straining bodies, and adulation of the crowds swept up in Hitler's mad vision, one senses the eagerness of millions to forge a "Thousand Year Reich" at, literally, any cost.Hugo Jaeger—Time & Life Pictures/Getty ImageIn a photo that somehow comprises both tenderness and horror, an American Marine cradles a near-dead infant pulled from under a rock while troops cleared Japanese fighters and civilians from caves on Saipan in the summer of 1944. The child was the only person found alive among hundreds of corpses in one cave.W. Eugene Smith—Time & Life Pictures/Getty ImageThe home front: At Sportsman's Park in St. Louis, a visiting New York Giant is caught in a rundown in the summer of 1943. At a time when seemingly everything in America - race relations, gender roles, the country's very idea of itself - was undergoing profound change, the national pastime offered an antidote to anxiety and dread. Namely, something familiar. Something unchanging.Wallace Kirkland—Time & Life Pictures/Getty ImagesMembers of the U.S. Army Air Corps' legendary 99th Pursuit Squadron, the Tuskegee Airmen, receive instruction about wind currents from a lieutenant in 1942. The Tuskegee fliers - the nation's first African American air squadron - served with distinction in the segregated American military.Gabriel Benzur—Time & Life Pictures/Getty ImagesA welder at a boat-and-sub-building yard adjusts her goggles before resuming work, October, 1943. By 1945, women comprised well over a third of the civilian labor force (in 1940, it was closer to a quarter) and millions of those jobs were filled in factories: building bombers, manufacturing munitions, welding, drilling and riveting for the war effort.Bernard Hoffman—Time & Life Pictures/Getty ImageArmy medic George Lott, wounded in both arms in November, 1944, grimaces as doctors mold a cast to his body. When Lott embarked on a 4,500-mile, seven-hospital journey of recovery, photographer Ralph Morse - astonished by the high level of medical care wounded troops received both at the front and behind the lines - traveled with him, and chronicled Lott's odyssey in a revelatory cover story for LIFE.Ralph Morse—Time & Life Pictures/Getty ImagesPhotographer W. Eugene Smith's picture of a Marine drinking from his canteen during 1944's Battle of Saipan is as iconic a war picture as any ever made. In fact, when the U.S. Postal Service released a "Masters of American Photography" series of commemorative stamps in 2002, Smith was included - and this image was chosen as representative of his body of work.W. Eugene Smith—Time & Life Pictures/Getty ImagesUnpublished. An exemplar of a bitter, grueling land battle, Iwo Jima also saw prodigious air and sea power brought to bear as American and Japanese troops clashed over control of the tiny Pacific island. American forces finally captured Iwo Jima - and its two strategic airfields - in late March, 1945.W. Eugene Smith—Time & Life Pictures/Getty ImagesUnpublished. A crew maneuvers an enormous piece of artillery during the Battle of Saipan, 1944. In the waning days of the struggle for the island, thousands of Japanese civilians and troops committed suicide, rather than surrender to American troops. Many leapt to their death from the top of sheer cliffs that fall 200 feet to rocks and surf below.Peter Stackpole—Time & Life Pictures/Getty ImagesUnpublished. American troops chat near a dead Japanese soldier on Iwo Jima. The degree to which the Japanese were willing to fight to the death, rather than surrender, is summed up in one remarkable statistic: Close to 20,000 Japanese soldiers were killed during the battle; only around 200 were captured.W. Eugene Smith—Time & Life Pictures/Getty ImagesGIs tramp in review across an English field, 1944, as the long-planned Operation Overlord - the D-Day invasion of France - draws near. With 160,000 Allied troops taking part, the cross-Channel attack was the single greatest air-land-and-sea invasion in military history.Frank Scherschel—Time & Life Pictures/Getty ImagesUnpublished. An American Marine readies to land on Guadalcanal during the five-month struggle for the island between late 1942 and early 1943. Three thousand miles south of Tokyo, Guadalcanal was a major shipping point for military supplies. The Allied victory there in February, 1943, marked a major turning point in the war after a string of Japanese victories in the Pacific.Joe Scherschel—Time & Life Pictures/Getty ImagesAmerican troops in the Philippines celebrate the long-awaited news that Japan has, finally, unconditionally, surrendered in August 1945.Carl Mydans—Time & Life Pictures/Getty ImagesPeace at last: V-J Day, Times Square, August 14, 1945.Alfred Eisenstaedt—Time & Life Pictures/Getty Image
