On the morning of April 18, 1942, the Imperial Japanese Navy knew exactly how close an American carrier had to be before it could drop bombs on Tokyo: two hundred miles. That number came from four months of watching American carriers strike Wake, Marcus, and the Marshalls. It was the reason no one was waiting over the capital when the first bombs fell shortly after noon, while Japanese aircraft were already in the sky conducting air-defense drills and a parade rehearsal for the Emperor’s birthday. The air raid sirens only sounded after the attack had ended.
What broke the calculation was a twin-engine army bomber squatting on a flight deck, its tail hanging over the sea. The Navy had searched for the right airframe and rejected two types before finding it. The Martin B-26 was so difficult to handle at low speeds that no one wanted it near a carrier deck. The Douglas B-23 had a wingspan too wide to clear the carrier’s island.
The North American B-25B fit, and trials off Norfolk settled the other half of the question: taking off from a carrier was possible, but landing back on one was impossible. The mission was one-way. At 7:38 that morning, a converted fishing boat, the 70-ton No. 23 Nitto Maru, spotted Task Force 16 about 650 nautical miles east of Japan and radioed a sighting report before the cruiser Nashville sank her.
Tokyo received word within the hour. The 26th Naval Air Fleet launched 29 medium bombers loaded with torpedoes from Kisarazu, escorted by 24 fighters with long-range fuel tanks, and sent them east to find the American ships. The search was competent but aimed at empty water. The first bombs fell on Japan while sixteen B-25s from the carrier Hornet struck targets across Honshu.
The damage was almost nothing. They burned a communications ministry transformer station. They set fire to more than fifty buildings around the Asahi Electric plant and thirteen buildings beside the Japan Hemp and Textile Company. One 500-pound bomb pierced the wall of a warehouse holding gasoline, heavy oil, and methyl chloride but did not explode inside; it bounced into an adjacent wooden building and detonated there.
Another fell as a dud, penetrated a house, and buried itself in the clay beneath it, forcing the army to cordon off a 650-foot perimeter to dig it out. Six schools and a military hospital were hit. About fifty people were killed and roughly four hundred wounded. The only target of real weight sat in the water at Yokosuka.
Edgar McElroy’s crew punched a 26-by-50-foot hole in the port side of a submarine tender that was midway through conversion into the light carrier Ryuho, delaying her completion by four months. That was the entire score: a tender under conversion, a transformer station, a warehouse district, against fifteen bombers lost in China and one interned at Vladivostok. Eighty men had gone. Eight never came back.
Over the next eight weeks, the Imperial Navy lost four carriers in a single morning, and the link between the two events did not pass through anything the bombers hit. Thirteen days before the raid, a staff officer named Watanabe Yasuji carried a file into the Naval General Staff building in Tokyo. Watanabe was Yamamoto’s man, sent by the Combined Fleet to argue a case his chief would not come argue himself. The file proposed seizing Midway, and behind Midway lay the real objective: forcing the American carriers into a battle they could not refuse.
Two officers in the First Division opposed it. Captain Tomioka Sadatoshi ran the plans section. Commander Miyo Tatsukichi was his air specialist. Neither man objected to hunting the American fleet.
Both argued the hunt should happen in the southwest Pacific, where Japanese land-based aircraft could reach the battle and American ships operated far from Pearl Harbor. Their alternative already had a name and a shape: an operation against Fiji and Samoa to cut the sea lane between the United States and Australia. The argument began on April 2 and was not polite. Miyo, a pilot arguing about aviation, dismantled the logistics of occupying an atoll 2,000 miles from the nearest Japanese base.
He was right, which carried no weight in that room. Watanabe’s closing answer was not a counter-argument. It was that Yamamoto would resign. Nagano, who ran the General Staff, yielded on April 5.
That date is the part most accounts miss: Midway was approved thirteen days before Doolittle’s bombers lifted off the Hornet. What the General Staff did not do was believe in it. They bowed to a resignation threat and kept doubting. The army, which had to supply garrison troops, still refused to participate.
The raid was not what wrote the plan. It destroyed the argument against it. Yamamoto had spent months warning that an American carrier would come to the home islands, and the staff had filed the concern under unreasonable. On April 18, the unreasonable thing happened over Tokyo in broad daylight and not a single aircraft was shot down.
Yamamoto wrote that down afterward: the skies of the imperial capital had been defiled without downing a single enemy plane. He had seen it coming and said so privately weeks earlier, complaining in a letter that people thanked him for the absence of air raids over Tokyo when the only party deserving credit was the enemy for not having come yet. Publicly he called it a “raid that does nothing,” and the newspapers were told to publish the damage figures: the schools, the hospital, the small numbers. The men who had to plan the next operation were not reading newspapers.
Tomioka, who had lost the argument, took a revised version of the Combined Fleet plan to his counterpart on the Army General Staff on April 12. Six days later, the army stopped arguing. Meanwhile, the Navy chased something it could not find. Eleven submarines from the 3rd and 8th Squadrons went out, two cruiser divisions went out, and the First Air Fleet, returning from the Indian Ocean with Akagi, Soryu, and Hiryu aboard, received orders in the Bashi Channel south of Formosa and turned north.
The pursuit lasted until April 24 and produced nothing, because Task Force 16 had been steaming east at top speed since the last bomber lifted off and was already more than halfway to Pearl Harbor before the search was properly organized. Then the bills started arriving. The crews landed in darkness over Zhejiang and Jiangxi, and Chinese villagers carried most of them west to safety. The Japanese army spent that summer burning the provinces that had done it, with Chinese death estimates reaching a quarter of a million people.
Eight airmen were captured; three were executed in October, one died of dysentery the following year, and four returned home in 1945. Four army fighter groups were held in the home islands and stayed there through 1942 and into 1943 while the south Pacific demanded them and did not get them. The defense line was rebuilt with new fishing boats pushed farther out, costing the fishing fleet boats it would never recover. On November 19, the army dissolved the national air-defense structure and replaced the Eastern Air Defense Brigade with Eastern Air Defense Command.
That command had about 150 guns at the time of the raid, most of them old and manned by untrained personnel, and numbers reached roughly 300 by mid-1944. Guadalcanal broke out in August, and the four groups still sat in Japan. Neither gun figure would have made a difference against what arrived in 1945. The operation approved on April 5, doubted until April 18, became unstoppable once it moved on a schedule that now had a reason to be short.
In May, the Fifth Carrier Division was bled dry in the Coral Sea. Shokaku was damaged by bombs, Zuikaku lost so much of her air group she was unusable, and neither ship sailed to Midway. Nagumo led the First Air Fleet in June with four carriers instead of six. Another thread runs underneath all of this.
The Japanese never discovered where the bombers came from. The idea of an army medium bomber taking off from a carrier was outside their imagination. So the staff searched for a land base instead, and the two candidates they settled on were the American facility at Midway and the airfields in the Aleutians. Roosevelt, asked the same question by reporters, said the planes came from “Shangri-La” and left it at that for the rest of the war.
The historical record has not resolved how much that guess shaped the planning. It appears in the campaign history of the National Park Service and in PBS’s treatment as a belief held by some staff officers, not as an official conclusion. Postwar interrogations of Imperial Navy officers, precise about Midway down to the composition of Kaga’s air group, assigned no number to it. What followed is not in dispute.
In April, two locations were identified as the source of the raid. Both were attacked in June, and part of the Aleutians fell on the seventh when some 2,500 Japanese troops landed on Attu and Kiska and captured ten American sailors from a weather station. What is certain is that the old calculations had been rewritten by then. Officers interrogated after the war said that while heading to Midway, they expected American patrol aircraft at 1,000 miles and bombers at 700.
The old two-hundred-mile number had vanished from planning entirely. On the morning of June 4, somewhere between twenty and twenty-five dive bombers from Enterprise and Yorktown put Akagi, Kaga, and Soryu beyond rescue in about five minutes. Hiryu was found and eliminated that evening. Four carriers and their air groups were lost in one day, and the Imperial Navy never replaced any of them.
Hornet was present there. Her torpedo squadron was nearly wiped out, and Lieutenant George Gay came out of the water the next morning as the sole survivor of fifteen aircraft that had made the attack. She lasted four more months until she reached Santa Cruz on October 26, 1942. She took four bombs and two torpedoes, and Japanese destroyers finished her off in the early hours of the next day.
Since then, no American carrier has been lost to enemy fire. Ugaki Matome, Yamamoto’s chief of staff, set down his verdict in his diary on the night of the raid, six months before all of it. It consisted of seven words: today the enemy had the victory. He was writing about a power station, a warehouse district, six schools, a hospital, and fifty dead civilians.
Nothing in that entry suggests he yet understood why he was right.