The rich and powerful take what they want. We steal it back for you.
So if the British don't supply 2 Regulars and 1 Tory in Georgia, and they withdraw to Available, and there is a single Continental left in Georgia, the Patriot player has control of Georgia during their Supply check and can keep, say, the two Continentals they have there?
Yes. (Unless Harold meant to have Control checked after all Supply was done, in which case I'm sure he'll say so.)