Operation Olympic called for a four pronged assault on Kyushu. Its purpose was to seize and control the southern one-third of that island and establish naval and air bases, to tighten the naval blockade of the home islands, to destroy units of the main Japanese army and to support the later invasion of the Tokyo Plain.
The preliminary invasion would began October 27 when the 40th Infantry Division would land on a series of small islands west and southwest of Kyushu. At the same time, the 158th Regimental Combat Team would invade and occupy a small island 28 miles south of Kyushu. On these islands, seaplane bases would be established and radar would be set up to provide advance air warning for the invasion fleet, to serve as fighter direction centers for the carrier-based aircraft and to provide an emergency anchorage for the invasion fleet, should things not go well on the day of the invasion. As the invasion grew imminent, the massive firepower of the Navy - the Third and Fifth Fleets -- would approach Japan. The Third Fleet, under Admiral William "Bull" Halsey, with its big guns and naval aircraft, would provide strategic support for the operation against Honshu and Hokkaido. Halsey's fleet would be composed of battleships, heavy cruisers, destroyers, dozens of support ships and three fast carrier task groups. From these carriers, hundreds of Navy fighters, dive bombers and torpedo planes would hit targets all over the island of Honshu. The 3,000 ship Fifth Fleet, under Admiral Raymond Spruance, would carry the invasion troops.
Several days before the invasion, the battleships, heavy cruisers and destroyers would pour thousands of tons of high explosives into the target areas. They would not cease the bombardment until after the land forces had been launched. During the early morning hours of November 1, the invasion would begin. Thousands of soldiers and Marines would pour ashore on beaches all along the eastern, southeastern, southern and western coasts of Kyushu. Waves of Helldivers, Dauntless dive bombers, Avengers, Corsairs, and Hellcats from 66 aircraft carriers would bomb, rocket and strafe enemy defenses, gun emplacements and troop concentrations along the beaches.
The Eastern Assault Force consisting of the 25th, 33rd and 41st Infantry Divisions would land near Miyaski, at beaches called Austin, Buick, Cadillac, Chevrolet, Chrysler, and Ford, and move inland to attempt to capture the city and its nearby airfield. The Southern Assault Force, consisting of the 1st Cavalry Division, the 43rd Division and Americal Division would land inside Ariake Bay at beaches labeled DeSoto, Dusenberg, Essex, Ford, and Franklin and attempt to capture Shibushi and the city of Kanoya and its airfield.
On the western shore of Kyushu, at beaches Pontiac, Reo, Rolls Royce, Saxon, Star, Studebaker, Stutz, Winston and Zephyr, the V Amphibious Corps would land the 2nd, 3rd and 5th Marine Divisions, sending half of its force inland to Sendai and the other half to the port city of Kagoshima.
On November 4, the Reserve Force, consisting of the 81st and 98th Infantry Divisions and the 11th Airborne Division, after feigning an attack of the island of Shikoku, would be landed -- if not needed elsewhere -- near Kaimondake, near the southernmost tip of Kagoshima Bay, at the beaches designated Locomobile, Lincoln, LaSalle, Hupmobile, Moon, Mercedes, Maxwell, Overland, Oldsmobile, Packard and Plymouth.
Olympic was not just a plan for invasion, but for conquest and occupation as well. It was expected to take four months to achieve its objective, with the three fresh American divisions per month to be landed in support of that operation if needed.