Isoroku Yamamoto, mastermind of Japanese sneak attack on U.S. fleet at Pearl Harbor, killed in action 80 years ago this hour #OnThisDay #OTD (Apr 18 1943)


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(Sunday, April 18, 1943, 9:35 a.m. local time; during Operation Vengeance, part of Solomon Islands campaign, part of the Pacific Theater of World War II) — Admiral Isoroku Yamamoto, commander-in-chief of the Japanese Combined Fleet and mastermind of the sneak attack on the U.S. fleet at Pearl Harbor, Hawaii, was killed today as his plane was shot down by U.S. Army fighter pilot Thomas Lanphier, Jr while approaching Bougainville in the Solomon Islands after American code breakers identified his flight plans.

Sixteen P-38s intercepted the flight over Bougainville, and a dogfight ensued between them and the six escorting Mitsubishi A6M Zeroes. First Lieutenant Rex T. Barber engaged the first of the two Japanese transports, which turned out to be T1-323 (Yamamoto’s aircraft).


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He fired on the aircraft until it began to spew smoke from its left engine. Barber turned away to attack the other transport as Yamamoto’s plane crashed into the jungle.

Yamamoto’s body, along with the crash site, was found the next day in the jungle of the island of Bougainville by a Japanese search-and-rescue party, led by army engineer Lieutenant Tsuyoshi Hamasuna.

According to Hamasuna, Yamamoto had been thrown clear of the plane’s wreckage, his white-gloved hand grasping the hilt of his katana, still upright in his seat under a tree. Hamasuna said Yamamoto was instantly recognizable, head dipped down as if deep in thought.


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A post-mortem disclosed that Yamamoto had received two .50-caliber bullet wounds, one to the back of his left shoulder and another to the left side of his lower jaw that exited above his right eye. The Japanese navy doctor examining the body determined that the head wound had killed Yamamoto.

Yamamoto held several important posts in the Imperial Japanese Navy (IJN), and undertook many of its changes and reorganizations, especially its development of naval aviation. He was the commander-in-chief during the early years of the Pacific War and oversaw major engagements including the attack on Pearl Harbor and the Battle of Midway.