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As for the garrison area, I think troops should be able to enter garrisoned structures where soldiers would fight inside (wont show, but add some lighting effects) and some soldiers would die until it is fully taken.
I don't suppose you have ever played Act of War: Direct Action, because that idea is pretty much a direct copy and paste from when any type of infantry attack a garrisoned civilian building in AOW. Just a side note, but quite a good idea.
