The Emperor of Japan changes his mind..

Lets say peace has already been signed between Japan and the Allies, but the emperor changes his mind and orders all his loyal followers over the radio to attack the American occupation forces. What do the Allies do, what does the Japanese armed forces do? What happens to the Emperor?
 
The Emperor would be removed from power and put on trail as a war criminal like many wanted to to begin with. Since there were no Japanese Armed Forces after the surrender, they could not do much. The Americans would simply crush the uprising. It would be a very bad occupation for Japan.
 
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