Well... as far as I know during the Medieval era there wornt much tactic involved.

My last battle was very intresting. My ittis was lined up on a hill with alot of It. Inf. and arbalesters, and flanking cav.

The ai never attacked me, he moved to the left... i moved a it ot left, he moved the right, i moved a bit to the right... this kept on going untill i got so pissed of i Charge him and totaly crushed him... then i regroupt when hes reinforcment came running in... and the whole thing kept on going.

I was the one defending but he never attacked me... just moved around... very anyoing...