Originally Posted by ajaxfetish
Sometimes the enemy will abandon the field if they decide they can't win, especially if they see you outmanouvering them and/or you're on a harder difficulty level. Oftentimes it can be a pain as their army lives to fight you another day, combined with other forces, but sometimes you can get a nice surprise. I remember a few times when they enemy decided to quit the field on me without realizing they had nowhere to retreat to. I've gotten some nice hefty ransoms, or a brand new province with undisturbed infrastructure, from time to time.
Ajax