Okay, I admit I came into this game late.
Units movement is way too slow. It takes a cavalry corps, in friendly territory, full supply, clear weather along roads 12 days to move one province? Seriously? I have been to those provinces, it is a 2 or 3 day walk, even if you double it that makes 4-6 days.
Forget most of the British stuff I said, my mistake. Still going to be essentially impossible to be on the Mons canal on the 23rd.