10 heavy cavalry vs some troops & mages

[SlipperyJim]

Yeah, I think Teraswaerto's first suggestion is probably the best idea. Put all 10 horsies in one group, off to the side, with orders to Attack Rear.

That said, I'll join the growing consensus that this is a bad situation and probably a waste of valuable units. You'd have much better odds of success with more cavalry, or perhaps a screen of infantry in the middle to act as a meat shield.