Downfall/Ketsu-Go, the Orders of Battle
Imperial General Headquarters would defend the home islands with six Area Armies. The 5th Area Army (HQ in Sapporo) would defend Hokkaido with five infantry divisions, the 11th (HQ in Sendai) with six infantry divisions, 12th (HQ in Tokyo) with two armored and twenty infantry divisions, 13th (HQ in Nagoya) with seven infantry divisions (two forming) and 15th (HQ in Osaka), with eight infantry divisions, Area Armies were responsible for the main island of Honshu and the 16th Area Army (HQ in Fukuoka), with two armored, fifteen infantry divisions was responsible for Kyushu. In reserve, in CHina) were the 6th Area Army (HQ in Wuchang-Hengyang) with eleven infantry divisions, the 23rd Area Army (HQ in Canton) with three infantry divisions and the North Chine Reserve Army, with one armored and five infantry divisions.
Supporting the defense were three Air Armies, the 1st was based in northern Honshu and fielded 600 kamizake and 500 combat aircraft, the 6th Air Army was based in southern Honshu and fielded 1,000 kamizake and 500 combat aircraft, in reserve was the 5th Air Army (in Korea) with 500 kamikazes and 200 combat aircraft.
The initial forces for Operation Olympic would be the 6th Army, consisting of the Fifth Amphibious Corps (2nd, 3rd and 5th Marine Divisions), First Corp (25th, 33rd and 41st Infantry Divisions) and Eleventh Corps (1st Cavalry, Americal and 43rd Infantry Divisions), in reseve would be the Ninth Corps (77th, 83rd and 98th Infantry Divisions. Army reserve would consist of the 40th Infantry Division and the 158th Regimental Combat Team.
The initial forces for Operation Coronet would be the Eighth Army, consisting of the Tenth Corps (6th, 31st, 81st Infantry Divisions) , Thirteen Corps (3rd and 6th Armored and 1st Infantry Divisions) and the Fourteenth Corps (32nd 93rd,75th Infantry Divisions) as well as the Tenth Army, consisting of the Third Amphibious Corps (1st, 4th and 6th Marine Divisions) and the Twenty-Fourth Corps (37th, 38th. 96th Infantry Divisions). Force reserve would be the 11th Airborne Division. Follow-up forces would consist of the First Army
(2nd, 8th, 9th, 24th, 28th, 69th, 76th, 87th, 89th, 104th Infantry and the 101st Airborne Divisions).
The Commonwealth would be represented by three divisions (2nd British,
7th Australian, and 5th Indian and the 3rd Commando Brigade); these are very suspect and any specific knowledge would be gratefully included!
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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