Several more million Japanese civilians plus perhaps close to one million U.S. casualties would've happened if Operation Cyclone had occurred along with cities like Tokyo, Kobe, or Yokohama getting nuked also in the autumn/winter of 1945. Operation Cyclone actually involved a two-pronged invasion where we land in southern part of Honshu first, fight our way up through increasingly violent, bloody pitched Vietnam-like battles until a second landing occurred in Spring of 1946 in central Japan to help push our invasion forces even further against Imperial opposition and help beleaguered U.S./Allied forces fighting in Honshu. The British, Dutch and French would've had units helping us in these armed maneuvers, particularly in original Honshu landings. The Soviets probably decide to intervene militarily too by attacking Hakkiado and landing amphibious units in northern Japan.