With horse archers, I sometimes make a straight line, and have them run in colums along the outside of an enemy army, and then running around the back to the opposide sides, and doing the same thing again. Of course most of the time, either a heavy cav will start chasing them, or infantry.

Ussually, battle ends up with half my cavalry running around the map trying to loose the enemy while the enemy army is completely disorganized and my Cataphracts isolate groups and tear them up.