Orders of battle for Downfall

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

Order of Battle for Olympic

Allied

United States
- Sixth United States Army (Gen. Walter Krueger)
  - Yakushima and Koshikijima Islands (Brig. Gen. Donald Myers) (22,000 men)
    - 40th Infantry Division
  - Tanegashima (Brig. Gen. Hanford MacNider) (7,600 men)
    - 158th Infantry Regiment
  - Miyazaki — I Corps (Maj. Gen. Innis P. Swift) (95,000 men):
  - Ariake — XI Corps (Maj. Gen. Charles P. Hall) (113,000 men):
  - Kushikino — V Amphibious Corps (Maj. Gen. Harry Schmidt) (99,000 men):
  - Sixth United States Army reserves
    - 11th Airborne Division (Maj. Gen. Joseph M. Swing) (15,000 men)
    - IX Corps (Maj. Gen. Charles W. Ryder) (79,000 men):
- Third Fleet (Adm. William F. Halsey):
  - 20 CV and CVL;
  - 9 BB;
  - 26 CB, CA, CL, CLAA;
  - 75 DD
- Fifth Fleet (Adm. Raymond A. Spruance):
  - 36 CVE;
  - 11 BB;
  - 26 CA and CL;
  - 387 DD and DE;
  - 394 AKA, AP, APA, APD, APH;
  - 977 LSD, LSM, LST, and LSV
- Seventh Fleet (Adm. Thomas C. Kinkaid):
- Far East Air Forces (Gen. George C. Kenney) (119,000 men): - 14 bomber groups, 10 fighter groups
- United States Strategic Air Forces in the Pacific (Gen. Carl A. Spaatz, Maj. Gen. Curtis LeMay)
  - Twentieth Air Force (Lt. Gen. Nathan Twining) (77,000 men)
    - 1,000 B-29 Superfortresses
  - Eighth Air Force (Lt. Gen. Jimmy Doolittle)
British Commonwealth
- British Pacific Fleet (operating as part of Third Fleet):
  - 6 fleet and light fleet carriers
- Tiger Force (detached from RAF Bomber Command):
  - 480–580 Avro Lancaster bombers (about half to be used as tankers for in-flight refuelling)
- Australian First Tactical Air Force
  - 20 fighter/attack squadrons from the Royal Australian Air Force

Japan

Second General Army (Field Marshal Shunroku Hata)
- 16th Area Army (Lt. Gen. Yokoyama Isamu) (600,000 men)
  - Northern Kyūshū—56th Army (Lt. Gen. Ichiro Shichida)^[1]
    - 145th Division
    - 312th Division
    - 351st Division
    - 124th Independent Mixed Brigade
    - 57th Division (20,000 men)
    - 4th Tank Brigade
  - Southeastern Kyūshū—57th Army (Lt. Gen. Nishihara Kanji) (150,000 men):
    - Tanegashima—109th Independent Mixed Brigade (5,900 men)
    - Miyazaki—154th Division, 156th Division, 212th Division^[1] (55,000 men)
    - Ariake—86th Division, 98th Independent Mixed Brigade, 1 regiment, 3 infantry battalions (29,000 men)
    - 25th Division, 5th Tank Brigade, 6th Tank Brigade^[1]
  - Southwestern Kyūshū—40th Army (Lt. Gen. Nakazawa Mitsuo) (85,000 men):
    - 303rd Division (12,000 men) (Sendai)
    - 206th Division (Fukiage)
    - 146th Division, 125th Independent Mixed Brigade (S. Satsuma Peninsula)
    - 77th Division^[1] 1 tank regiment
  - 216th Division^[1] 4 brigades
Air General Army (Gen. Masakazu Kawabe)
- Sixth Air Army — Kyūshū
  - 5,000 aircraft assigned as kamikazes, 5,000 aircraft available for kamikaze service, 7,000 aircraft in need of repair
- 100 Koryu-class midget submarines, 250 Kairyu-class midget submarines, 1,000 Kaiten manned torpedoes, 800 Shinyo suicide boats

Order of Battle for Coronet

Allied

United States
- First United States Army (Gen. Courtney H. Hodges):
  - III Amphibious Corps:
  - XXIV Corps:
  - Unnamed follow-on corps:
- Eighth Army (Lt. Gen. Robert L. Eichelberger):
  - X Corps:
  - XIII Corps:
    - 13th Armored Division
    - 20th Armored Division
  - XIV Corps:
  - Unnamed follow-on corps:
- United States Army Forces Pacific reserve:
  - 11th Airborne Division
  - 97th Infantry Division
  - Unnamed follow-on corps:
  - Unnamed follow-on corps:
British Commonwealth
- Commonwealth Corps, (Lt. Gen. Charles Keightley):

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.

First General Army (Field Marshal Hajime Sugiyama
- Twelfth Area Army (Gen. Shizuichi Tanaka)
  - 36th Army - Urawa, Saitama
    - 81st Division
    - 93rd Division
    - 201st Division
    - 202nd Division
    - 206th Division
    - 214th Division
    - 1st Armored Brigade
    - 4th Armored Brigade
  - 51st Army - Tsuchiura, Ibaraki
    - 44th Division - Ogawa
    - 151st Division - Mito
    - 221st Division - Kashima
    - 115th Independent Mixed Brigade -　Shibasaki
    - 116th Independent Mixed Brigade - Hokota
    - 7th Independent Armored Brigade - Ogawa
  - 52nd Army - Sakura, Chiba
    - 3rd Imperial Guards Division - Naruto
    - 147th Division - Mobara
    - 152nd Division - Choshi
    - 234th Division - Sōsa
    - 3rd Independent Armored Brigade
    - 8th Artillery Headquarters
  - 53rd Army - Isehara, Kanagawa
    - 84th Division - Odarawa
    - 140th Division - Kamakura
    - 316th Division - Isehara
    - 117th Independent Mixed Brigade - Numazu
    - 2nd Independent Armored Brigade - Tsudanuma
    - 11th Artillery Headquarters - Hiratsuka
  - Tokyo Bay Garrison - Choshi, Chiba
  - 321st Division - Tokyo

Notes

1 2 3 4 5 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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