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WI: US Invades Hokkiado Northern Japan in Fall 1944?



Reacting to the fall of the Marianas, Imperial Headquarters quickly formulated new plans for a decisive showdown with the enemy. These plans were given the code name "Operation Victory." The plans were numbered one through four, according to the four probable directions in which the enemy might advance: 1) the Philippines, 2) Taiwan and the Ryukyus, 3) the Japanese mainland and 4) Hokkaido.
Hiromichi Yahara

So the United States decides to invade Hokkaido in the fall of 1944. What would kind of force would be needed to secure the Island? Could other operations still occur elsewhere? Impact on the war and Japanese moves? Soviet reaction to the invasion?

In mid-July 1945 shipping, cities and military facilities in Hokkaido were attacked by the United States Navy's Task Force 38. On 14 and 15 July aircraft operating from the task force's aircraft carriers sank and damaged a large number of ships in ports along Hokkaido's southern coastline as well as in northern Honshu. In addition, on 15 July a force of three battleships and two light cruisers bombarded the city of Muroran.
https://en.wikipedia.org/wiki/Hokkaido
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