Cavalry reign supreme on the battlefield, and make up the bulk of my armies. Play it defensive with a ´thin´single line of infantry (4-5 units), 2-3 units of archers (preferly Aux. or Creatian), then mass the rest as medium/heavy cavalry (~11 units) on ONE flank a bit off (group into two lines).

Your enemy will advance towards your battleline under fire from your archers, causing some to break, they will clash with your infantry and get stuck there for a while. Once the enemy is heavly engaged with your infantry, let your massed cavalry swing around from the flank (and some distance) and start smashing into the enemys rear formations from the side, then turn towards charging towards your own line of infantry. This generally result in huge casualties for the enemy, lots of routing units that can be cut down, a reasonable intact infantry.