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Invasion of Japan

Operation Downfall
Part of World War II, the Pacific War
Operation Downfall - Map.jpg

A map outlining the Japanese and U.S. (but not other Allied) ground forces scheduled to take part in the battle for Japan. Two landings were planned:

  1. Olympic—the invasion of the southern island, Kyūshū,
  2. Coronet—the invasion of the main island, Honshu.
Date 1 November 1945–1947 (projected)
Location Mainland Japan
Result Cancelled after the unconditional Japanese surrender on August 15, 1945.
Belligerents
United States United States
 United Kingdom
 Australia
 Canada
 New Zealand
 France
Empire of Japan Empire of Japan
Commanders and leaders
Harry S. Truman
Douglas MacArthur
Chester W. Nimitz
Curtis LeMay
Carl Spaatz
Walter Krueger
Joseph Stilwell
Robert Eichelberger
Courtney Hodges
William F. Halsey
Raymond Spruance
Marc Mitscher
Clifton Sprague
Clement Attlee
Bruce Fraser
Bernard Rawlings
Hirohito
Kantarō Suzuki
Naruhiko Higashikuni
Korechika Anami
Mitsumasa Yonai
Yoshijirō Umezu
Soemu Toyoda
Hajime Sugiyama
Shunroku Hata
Masakasu Kawabe
Shizuichi Tanaka
Isamu Yokoyama
Keisuke Fujie
Tasuku Okada
Eitaro Uchiyama
Kiichiro Higuchi
Units involved

Ground units:

U.S. Army Forces, Pacific

(52–54 divisions in total)

Naval units:

United States Pacific Fleet

Air units:
USASTAF Pacific

United States Fifth Air Force
United States Seventh Air Force
United States Thirteenth Air Force
Australia First Tactical Air Force

United Kingdom Tiger Force

Ground units:

First General Army

Second General Army

Patriotic Citizens' Fighting Corps

(66 divisions, 36 brigades, and 45 regiments, not counting PCFC units.)

Navy units:
Navy General Command

Air units:
Air General Army

  • Empire of Japan First Air Army
  • Empire of Japan Sixth Air Army

Empire of Japan Third Air Fleet
Empire of Japan Fifth Air Fleet
Empire of Japan Tenth Air Fleet
Empire of Japan Sixth Air Fleet

Empire of Japan Twelfth Air Fleet
Strength

United States More than 5,000,000 (projected)
United Kingdom 1,000,000 (projected)

~ 6,000,000 total (projected)

4,335,500 military,
31,550,000 civilian conscripts

35,885,500 total

A map outlining the Japanese and U.S. (but not other Allied) ground forces scheduled to take part in the battle for Japan. Two landings were planned:

Ground units:

U.S. Army Forces, Pacific

(52–54 divisions in total)

Naval units:

United States Pacific Fleet

Air units:
USASTAF Pacific

United States Fifth Air Force
United States Seventh Air Force
United States Thirteenth Air Force
Australia First Tactical Air Force


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