Nice set-up, but I'm intrigued as to why so many gamers go to enormous effort to reproduce such a one-sided engagement (unless you let the British bring their ladders with them, and even then.....), whereas nobody ever games "the other assault" on the opposite bank of the river. The latter is much more interesting and less straightforward tactically, offers both sides a chance of winning, and - if properly supported/followed up on the British side - can influence the main assault.