Current boat fighting i think can be improved a lot. Right now it works same as siege tower in water. 2 features which I think are feasible can be added. Option 1: Visible garrsion: It should be visible how many units are there on boat: Some one has already developed this mod of visible garrsion. Attackable units: Units should be attackable. This is work same as walls. The unit can attack other in unit in their range that means boats with archers will have higher range compared