What do you usually do with your cavalry, charge dirctly at a unit (double click on them) or charge through the unit (charge at a point beyond the enemy)? I find that the most effective charge is a 'sideswipe' in a wedge fomation at a slight angle to the enemy unit then flank for melee or disengage (very easy from this position) for another charge. This manouver is only posibble by indirectly charging. I also find the indirect method much better for 'mopping up' as the formation doesn't stop for a single unit just rides everyone down then wheel around for another go.