You do realize that mortars and rockets have 750 range, right? They can't move from wherever you deploy them, but if you deploy them correctly they can pretty much cover the entire battlefield. Besides, mortars/howitzers > cannons once you tech up. In my battle against Quebec (after they formed their own nation) I had 3 batteries of 4 inch mortars in my army; the first volley of percussion shells completely eliminated an entire unit of 12 lb howizters and knocked out one gun plus the crew of the adjacent 12 lb foot artillery unit. I do imagine the 64 lb great guns probably knock down fortified buildings like crazy, though.
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