nice strategy but in my experience armies aren't usually that diverse. I'm either fighting with scraps of militia and mercenaries, or a trained force of 3 Levy Spearmen, 3 Armoured Swordsmen, 6 Retinue Longbowmen, 7 English Knights and a General. The trained force is very rare as it usually gets depleted pretty soon and bolstered by mercenaries.

Defending I always hold the line with my infantry, and depending on what cavalry I have, I will ruin the enemy. I hate facing artillery so I always send a unit of cavalry (the worst one in the stack) to take that out.

Another thing I like is sending my two flank cavalry units to take out the enemy archers while my infantry is holding their infantry and cavalry. Then when the archers rout they get taken down pretty quickly, while my remaining cavalry rounds up the rest of the enemy.