Japan campaign

The Japan campaign was a series of battles and engagements in and around the Japanese home islands, between Allied forces and the forces of Imperial Japan during the last stages of the Pacific campaign of World War II. The Japan campaign lasted from around June 1944 to August 1945.

Japan campaign
Part of Pacific War

Task Force 38, of the U.S. Third Fleet maneuvering off the coast of Japan, 17 August 1945, two days after Japan agreed to surrender.
DateApril 18, 1942 [1]-September 1, 1945 [2]
Mainland and Japan Islands, Pacific

Allied Victory


 United States
 United Kingdom
 New Zealand

 Soviet Union (from August 1945)
 Japanese Empire
Commanders and leaders

Douglas MacArthur
William Halsey Jr.
Curtis LeMay
Chester W. Nimitz
Joseph Stilwell
Raymond A. Spruance
Marc Mitscher
Bernard Rawlings
Bruce Fraser
Philip Vian
Aleksandr Vasilevsky
Rodion Malinovsky
Maksim Purkayev
Dmitry Ponomarev

Anatoly Petrakovsky

Shunroku Hata
Kiichiro Higuchi
Tadamichi Kuribayashi 
Mitsuru Ushijima 
Matome Ugaki 
Seiichi Itō 
Keizō Komura
Fusaki Tsutsumi

Shizuichi Tanaka

Air war

Periodic air raids on Japan were the first attacks undertaken by Allied forces. In late 1944, these raids were followed by a major strategic bombing of cities, factories, and other war infrastructure throughout Japan, most notably:

The air raids resulted in heavy damage to Japanese infrastructure and the deaths of 241,000–900,000 Japanese citizens (mostly civilians), as well as the loss thousands of aircraft and flak guns. The Allies, in turn, only lost a few hundred aircraft (mostly bombers) to Japanese anti-air defenses and fighters.

Land and sea battles

In early 1945, there were two major island battles:

  • The Battle of Iwo Jima (16 February to 26 March): Of approximately 21,000 Japanese defenders, only 216 survived.
  • The Battle of Okinawa (1 April to 21 June): Of approximately 100,000 Japanese defenders, only 24,455 survived.

There were also two naval battles:

  • Operation Ten-Go (7 April): Most of the Japanese vessels committed were lost.
  • The Battle of Tokyo Bay (22 and 23 July 1945): Most of the Japanese vessels committed were heavily damaged or lost.

Allied warships also bombarded several Japanese cities during July and August 1945.

The battles of Iwo Jima and Okinawa foretold what was to be expected when the Japanese Home Islands were attacked. Iwo Jima and Okinawa were lost only after extremely fierce resistance was overcome. In both cases, the Japanese refused to surrender and there were few survivors. While Japanese losses were extremely high, Allied forces paid dearly to take both islands.

Naval operations included a suicidal Japanese counteroffensive on 7 April 1945 (Operation Ten-Go), to relieve Okinawa and an Allied campaign to place air and submarine-delivered mines in Japanese shipping lanes. This was illustrated by the naval surface interdiction of Tokyo Bay in July 1945.

In late 1945, the Soviet Union launched a series of successful invasions of northern Japanese territories, in preparation for the possible invasion of Hokkaido:

The end

Tokyo from the air after the firebombing of Tokyo, 1945.

World War II ended with the surrender of Japan after the atomic bombings of Hiroshima and Nagasaki. Before those two attacks, Japan was unwilling to surrender. The firebombing of Japanese cities resulted in 350,000 civilian deaths but did not move the government towards surrender. The Japanese government was clearly prepared to fight an Allied invasion of the home islands as fiercely as they had defended Iwo Jima and fought on the Japanese home island of Okinawa.

The Japan campaign was intended to provide staging areas and preparation for a possible Allied invasion of Japan and to support Allied air and naval campaigns against the Japanese mainland. Japan still had a homeland army of about two million soldiers and sufficient resources to cripple an Allied invasion. Consequently, had that invasion been necessary, it most likely would have resulted in a much higher death toll for both sides.

See also


  1. The date of Double Strike, which is the beginning of Mainland Air Strike.
  2. The Archipelago Landing Operation is over.


  • Drea, Edward J. (1998). In the Service of the Emperor: Essays on the Imperial Japanese Army. Nebraska: University of Nebraska Press. ISBN 0-8032-1708-0.
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