A Japanese staff officer sat alone in a small cabin aboard a heavy cruiser, opening a leather-bound logbook. The date was the evening of June 19, 1944. He wrote a single number: 35. That morning, 430 Japanese aircraft had launched from nine carriers.
Only 35 returned. The Battle of the Philippine Sea, fought over two days, effectively ended the Imperial Japanese Navy as a fighting force. The road to that disaster began months earlier, with a crashed airplane and a stolen briefcase. On March 31, 1944, Admiral Mineichi Koga, commander of the Combined Fleet, flew into a typhoon over the Philippines and was killed.
A second aircraft carried his chief of staff, Vice Admiral Shigeru Fukudome. It also crashed. Fukudome survived, but his locked briefcase floated ashore carrying Japan’s strategic war plan, known as “Plan Z. ”
Filipino guerrilla fighters found the briefcase.
Their leader was James Cushing, an American mining engineer who had taken to the mountains after the Japanese occupation. The documents contained operational codes, signal procedures, and the entire strategic framework for Japan’s coming decisive battle. Translated copies reached Admiral Chester Nimitz in Honolulu by mid-May 1944. Understand the enemy’s thinking, and you can anticipate its moves.
The plan, revised as “Operation A-Go,” relied on a core assumption. Japanese carriers would remain far outside the range of American aircraft, strike first, and be supported by roughly 500 land-based aircraft stationed in the Marianas. There was one problem. American carrier aircraft had been bombing those airfields for weeks.
By the time the Japanese fleet approached, about 200 of the 500 aircraft had already been destroyed. Japanese commanders on Guam, Tinian, and Saipan failed to report the true scale of the losses. Admiral Jisaburo Ozawa, commanding the Japanese fleet, believed the plan was intact. He sailed toward a decisive battle whose main weapon no longer existed.
The pilot force was also a shadow of what it had been. Japan entered the war with approximately 3,500 trained naval pilots. By mid-1944, most of that original cadre was dead, consumed in grinding campaigns like the air war over Rabaul. Replacement pilots received shortened training, often as little as six months.
Fuel was rationed. Flight hours were cut. Many had never fired live ammunition. Their aircraft, including the once-dominant Zero, were now outclassed by the American F6F Hellcat, a fighter designed specifically to defeat them.
Conditions only worsened. From its anchorage at Tawi Tawi, the Japanese fleet was stalked by American submarines. After one near miss, Ozawa banned open-sea training flights in late May. His pilots headed toward the most important carrier battle of the Pacific War without the practice that might keep them alive.
On June 15, American Marines landed on Saipan. The invasion was the lever that forced the battle. If Ozawa’s fleet could break through and strike the transports still unloading supplies, the Marines would be cut off and destroyed. Admiral Raymond Spruance, commanding the Fifth Fleet, refused to dash west to meet the enemy.
He would fight a defensive battle, protecting the invasion force. His aviators were furious, but his caution meant American aircraft were exactly where they needed to be on June 19. Two fleets searched for each other for days. On the afternoon of June 18, Japanese scouts located the Americans at the extreme range of Ozawa’s aircraft.
He could have launched a strike at dusk, but his pilots could not land on carriers at night. Showing compassion for his men, Ozawa held his force. He would wait for dawn. That decision cost him hours of American preparation.
Another American advantage appeared that morning. The VT proximity fuse, a top-secret invention, allowed anti-aircraft shells to detonate when they merely passed near an aircraft. Over the deep waters of the Philippine Sea, the secrecy restrictions were lifted. Japanese aircraft flying into the American fleet now crossed a curtain of shells that found them even when they missed.
At 10:00 a. m. , radar picked up the first Japanese strike. Of the 69 aircraft in that wave, 42 were shot down before reaching the American fleet.
The survivors faced heavy anti-aircraft fire. The second wave of 128 aircraft was devastated as well, including losses from friendly fire when Japanese ships opened fire on their own planes. The third wave lost 47 of 49 aircraft. The fourth wave of 82 aircraft could not find the American fleet at all and headed for Guam to refuel, only to be slaughtered by American fighters waiting over the ruined airfields.
Meanwhile, American submarines were taking their toll. The USS Albacore struck the carrier Taiho, Ozawa’s flagship, with a single torpedo. The damage seemed containable. But a junior damage-control officer opened the ship’s ventilation systems to clear fuel fumes.
The fumes spread throughout the ship instead. Hours later, a single spark detonated them. The Taiho, the newest and most advanced Japanese carrier, was torn apart from within and sank. One pilot, Sakio Kamatsu, dived his Zero into an incoming torpedo to protect his ship.
He died believing he had saved her. He had only bought her six hours. The USS Cavalla struck the veteran carrier Shokaku with four torpedoes. She burned for three hours and sank with over a thousand of her crew.
In the sky above the American fleet, pilots like Alexander Vraciu and David McCampbell destroyed Japanese planes in numbers that would make them legends. By late afternoon, the last Japanese aircraft had disappeared from American radar screens. A staff officer on the USS Lexington watched the falling trails of smoke and said it was like shooting turkeys back home. The name stuck: the Great Marianas Turkey Shoot.
Ozawa, unaware of the true scale of the disaster, believed his pilots had sunk many American carriers. That evening he ordered a logbook entry. The number was 35. He had started the day with 430.
The following day, June 20, American scouts found his retreating fleet at the extreme edge of their range. With only 75 minutes of daylight left, Admiral Marc Mitscher ordered a strike. Every pilot knew the fuel math. Many would not make it back.
Two hundred sixteen American aircraft struck the Japanese fleet in 20 minutes of fading daylight. They sank one carrier and two oilers and damaged others. Japanese aircraft losses brought the two-day total to roughly 550 to 600 planes. Then the American pilots turned for home: a 275-mile flight into a moonless night.
Mitscher made his second great decision of the battle. He ordered every ship in the task force to turn on every light they had. Searchlights, navigation lights, deck lights, and star shells turned the American fleet into a beacon. Some pilots found their carriers.
Some landed on any carrier they could find. Some ran out of fuel short of the fleet. Of the 202 men who went into the water, 49 were lost. The final American losses were 123 aircraft and 109 dead.
Japanese losses included three carriers, two oilers, and nearly 3,000 sailors and pilots. The ratio of Japanese to American losses on June 19 alone was nearly twelve to one. One Japanese staff officer wrote after the war that his pilots never had a chance. Poorly trained young men in fragile aircraft, executing a plan the enemy had understood in advance, without the land-based support that plan required, faced radar-directed combat air patrols and proximity-fused anti-aircraft fire.
Ozawa submitted his resignation. It was refused. He would lead a carrier force once more, at the Battle of Leyte Gulf in October 1944, where his carriers were deliberately used as bait to draw the American fleet away from the invasion beaches. It worked.
His carriers were destroyed. He survived the war and died in 1966, never learning that a recovered briefcase had given the Americans the blueprint for his defeat. The battle produced another consequence. Vice Admiral Takijiro Onishi, watching Japan’s carrier aviation collapse, concluded that conventional attacks would never work again.
In October 1944, he organized the first kamikaze units. Nearly 3,900 Japanese pilots died in suicide attacks in the final ten months of the war. They sank dozens of ships and damaged hundreds more, but they changed nothing. Onishi took his own life on August 16, 1945, apologizing to the families of the young men he had sent to die.
The political consequences came even faster. Prime Minister Hideki Tojo, whose government had staked everything on victory, fell in July 1944 after the loss of Saipan. He was later convicted as a war criminal and executed. The Marianas were secured.
American engineers built the longest runways in the world on those islands. In the fall of 1944, B-29 Superfortress bombers began arriving. They started flying north to burn the cities of Japan. On August 6, 1945, a single B-29 named Enola Gay took off from Tinian carrying a single weapon.
Over Hiroshima, it was dropped. Fourteen months earlier, Admiral Soemu Toyoda had issued the order for the battle that would decide the fate of the empire. “The fate of the empire depends on this one battle,” he said. He was right.
The battle ended not with a great dramatic spectacle but with a small, dry entry in a logbook on a ship whose commander did not yet know he had lost. The number was 35. That was the fate of the empire. Some battles end when the guns fall silent.
This one ended when that number was written.