I remember on one occasion the last few orcs got tired out and had to pass turns due to lack of stamina, haha.
This is how I deal with orcs, when they try to push I draw back and fire at them until they are fatigued and can not attack any more, then they get surrounded by billhooks and other melee fighters.
I wonder how (if at all) the orc warriors and their armour got reballanced, because seriously their armour takes nearly no damage ^-^