Orders of battle for Downfall

The units listed to participate in Operation Downfall — the planned Allied invasion of Japan — as planned in August 1945 were:

Order of Battle for Olympic

Allied

Should these four corps prove insufficient to accomplish the tasks assigned, elements earmarked for "Coronet" would be used to reinforce Sixth Army at the rate of three divisions per month beginning about 30 days after the initial landings.

Japan

Order of Battle for Coronet

Allied

Thirty days after the initial assault, each army would be reinforced by a corps of 3 divisions. Five days later an airborne division and a United States Army Forces Pacific Reserve Corps of 3 divisions would be made available. Strategic reserve for the entire operation would consist of a corps of 3 divisions located in the Philippines and divisions from the United States to permit reinforcement at the rate of 4 per month.[1]

Unsourced listing of the aforementioned reinforcements:

Japan

All Japanese formations on Honshu were badly understrength and lacking in equipment. The American First Army's landings would likely have been opposed by the Japanese 52nd Army and the Eighth Army's landings by the Japanese 53rd Army.

Notes
  1. "Chapter XIII "Downfall" The plan for the invasion of Japan". US Army Center of Military History. Retrieved 7 June 2020.
  2. The majority of these units (86,000 men total) would have been ordered to counterattack at Ariake, though it is questionable how many of the tanks would have been able to survive an air attack.
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