The admiral who feared war with America yet designed Pearl Harbor
“For six months or a year I can run wild, but I have utterly no confidence for the second and third years.”
Isoroku Yamamoto was an admiral of the Imperial Japanese Navy and an early advocate of naval aviation. His observation of American industry and oil supplies convinced him that Japan had little prospect in a prolonged war, yet once war was chosen he sought a short opening advantage. As commander of the Combined Fleet, he forced through the Pearl Harbor strike to gain time for Japan's southern resource offensive, a choice that produced both tactical success and determined American entry into the war. He continued to command after the defeat at Midway and was killed when U.S. forces intercepted his aircraft in 1943.
Activities and affiliations
Career Timeline
- 1904Graduated from the Naval Academy and entered the navy
- 1905Fought at Tsushima, was wounded and lost two fingers
- 1919–1921Studied at Harvard University
- 1925–1928Naval attaché at the Japanese embassy in Washington
- 1936–1939Vice Minister of the Navy, opposed the Tripartite Pact
- 1939–1943Commander-in-chief of the Combined Fleet
- 1941Secured and directed the Pearl Harbor attack
- 1943Killed when his aircraft was intercepted over Bougainville
Related historical events
Opposing the Tripartite Pact and Facing Assassination Threats, 1936-1941
Within the navy, Yamamoto repeatedly clashed with the Army's continental expansion line. He saw the fleet as a means of projecting force through gunboat diplomacy rather than as a transport service for invasion troops, and on that basis opposed both the invasion of China and war with the United States. His studies at Harvard (1919-1921) and two postings as a naval attaché in Washington, where he observed American industry and the oil problem at first hand, underpinned that judgment. Appointed navy vice minister in 1936, he also opposed the Tripartite Pact with Germany and Italy in 1940.
That stance made him dangerous in domestic politics. Around 1938, young army and naval officers publicly attacked Yamamoto along with Mitsumasa Yonai and Shigeyoshi Inoue for opposing a tripartite pact, and he received a steady stream of hate mail and death threats from Japanese nationalists. The Army attached military police to "guard" him as a means of watching him, and on August 30, 1939, Navy Minister Mitsumasa Yonai reassigned him to sea as commander-in-chief of the Combined Fleet. Yonai was certain that if Yamamoto remained ashore he would be killed before the year ended.
The move both protected him and pushed him toward the post that led to Pearl Harbor. When Hideki Tojo became prime minister in October 1941, many observers thought Yamamoto's career was over, yet his immense popularity in the fleet and his close ties to the imperial family kept him in command. In the end he lost the political struggle over the Tripartite Pact and the opening of war with the United States, and went on to command the war he had judged unlikely to be won.