Ooh the ai are sneaky.
In the brandywine battle I had a arty duel going on, to decide wherther i was going to attack from the front or the rear, over the clearing west(i think) of the main ford and I had sent 2 guard units and one grenadier to the "back passage". Next thing I know a bunch of minute men has ambushed my troops, and thats not the sneaky part, while I was beating off the ambush 2 units of dragoons tore away form the ford while I was preoccupied went through a gap in my battle line and wiped out my artillery. Without battery support I quickly lost the battle in a near defeat.
I have to say i am starting to warm to the AI's abilities.