What about the second issue, of units running off on you right when your winning, and if you win and a units managed to run off on you then its destroyed.
Except nonmerc units are lost, if you win, even if your surrounded by provinces. I only get to keep running units if I lose the battle it seems.
And why do they so often wait to run till after your winning?? Gosh we better get out of here, we got them massively outnumnbered, they might try something!