Places like Philly and Boston have potential. Dunno what NY looked like back then. None of those cities are particularly hilly, nor are there any real historically high landmarks in either of those places. Perhaps someone else can shed light on some places of import in the 13 colonies. *shrug*

Then again, it might not be DURING the revolution, more before/after perhaps? Maybe we'll see another "10 years later" type shift like we did in AC2.
For all your umbrella needs!