Make sure any of your infantry that spawn are as far back and parked as you can. You also need pretty good morale going in.īasically, you siege, attack by merely parking your archers in a right at your spawn, (or if needed advance so that they can actually hit stuff), line up and have them shoot until they expend all their arrows and switch to melee weapons. I also had several NPCs with good medical skills etc that help convert 'deaths' to 'injuries'.
One trick I used to use (for non-seige engine attacks) is to load up on good archers, and organize them top of the list.