SotheypreparedonalloutdefenseoftheJapanesehomeislands, andtheUnitedStatesplannedaninsaneinvasionthatwouldhavedwarfedthe D Daylandingsinbothscaleandlossoflife.
Butiftheatomicbombswereneverutilized, forwhateverreason, andJapancontinuedtorefuse a surrender, hereishow a UnitedStatesledinvasionoftheJapanesehomeislandswouldhaveplayedout.
Theattackwouldthenswitchinto a defenseandanoccupation, whiletheoccupiedportionofKyushuwouldbeusedasthenewbaseofoperationsforairattacksacrossallofJapanandas a basetolaunchthemainAlliedoffensiveonTokyofromthesubsequentinvasionoftheislandofHanShuwascodenamedOperationCornettanditwouldhavebeenevenbigger.
However, JapanonLeehadenoughammunitionandsuppliestoproperlyequipped 1.2 millionofthosemen, soitwouldbethosemenonthebeachesthatwouldbeconfrontingtheallies.
Iftheyfailed, Japan's primaryobjectivewastomakethecostofinvasiontoohighforthealliestoacceptandforce a kindofarmisticewhereJapancouldhopefullyhangontosomeofitsconquests.