Orders of battle for Downfall

Proposed landing sites for Operation Downfall

Kyushu

Kantō Plain

Operation Downfall was the proposed Allied plan for the invasion of the Japanese home islands near the end of World War II.

The operation had two parts, Operation Olympic, intended to capture the southern third of the southernmost main Japanese island, Kyūshū, and Operation Coronet, the planned invasion of the Kantō Plain, near Tokyo, on the main Japanese island of Honshu. Olympic was scheduled for November 1945, to be followed by Coronet in early 1946.

If Downfall had taken place, it would have been the largest amphibious operation in history, surpassing D-Day.^[1] The planned operation was canceled when Japan surrendered following the atomic bombings of Hiroshima and Nagasaki, the Soviet declaration of war, and the invasion of Manchuria.^[2]

^ "XIII 'Downfall'". The Plan For The Invasion of Japan. United States Army Center of Military History. Archived from the original on August 17, 2019. Retrieved January 23, 2016.
^ Giangreco, Dennis M. (2009). Hell to Pay: Operation Downfall and the Invasion of Japan, 1945–1947. Annapolis, MD: Naval Institute Press. p. xvi. ISBN 978-1-59114-316-1.

[1] "XIII 'Downfall'". The Plan For The Invasion of Japan. United States Army Center of Military History. Archived from the original on August 17, 2019. Retrieved January 23, 2016.

[2] Giangreco, Dennis M. (2009). Hell to Pay: Operation Downfall and the Invasion of Japan, 1945–1947. Annapolis, MD: Naval Institute Press. p. xvi. ISBN 978-1-59114-316-1.

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