Given some filed expedient work I could actually field one 1" smooth bore Parrot, one 1" 42 PDR smooth bore, one GB 8 inch siege howitzer, a 50 cal. navel guna and 58 cal. field gun to take on the fort defenses. Then for the siege of the fort a 6PDR coehorn, Popcan Dictator, pop can coehorn and a GB Coehorn...
The Smooth bore Parrot is a real possibility. the GB 8 inch is unlikely.
Unless some one shows up up with a fairly large direct fire gun, I think it will be Mortars and the bowling ball mortars at that, that will destroy the fort.
The Fort is 6' high and 7' x 8' square. It is a large target. It will be put on the range tomorrow. It will be in place Saturday during open range. You won't be allowed to shoot at the fort on Saturday, but there isn't any reason you can take ranging shots.