a trick i like to use is to make my centre and right weaker then my left, all my heavy cav is there, when the main battle starts rout the centre units and have the enemy pour through to try to kill my gen. have my light cav aid my general with a series of charge and recharge, then as this is happening wheel my heavy cav to back and charge. basicaly you annhilate the opposing army and take only a few losses unless you time it wrong, timing is everything