WI: British Emancipation Proclamation During the American Revolution

What if the British, or even just a number of British Commanders, freed the slaves of the rebelling American colonies?

How would this take place? Would we see it limited to just the areas that were under Patriot control similar to the Union’s EP on Confederate territory? Maybe just retreating British commanders make it a policy of freeing slaves as they retreat? Or just crippling the Foundinf Fathers, many of whom were slave owners?

What impact does this have on the Revolution? If the Revolution were still successful, what happens to the large population of now freed African Americans?
 
Lord dunmore does just that. In South Carolina freed african Americans, serve as judges, The uk has a twenty thousand men pioneer corps. 100000 are freed by the British and 6000 by the patriots.
 
Lord dunmore does just that. In South Carolina freed african Americans, serve as judges, The uk has a twenty thousand men pioneer corps. 100000 are freed by the British and 6000 by the patriots.

Right but I’m talking about a more large scale event
 
Ironically Georgia the one former colony which restablished royal government, had a number of Native American, and African Americans serving as prominent officials.
 
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