I have had several generals ambushed while they were standing in normal stance. The enemy, a different one each time, just waltzes up and "ambushes" me. It is like they are ratmen from Warhammer. I don't know if I am unaware of some mechanic, but I have seen nothing on them to suggest an ability and my own generals certainly can't get that ability. My armies struggle to progress when the enemy has the ability to ambush at will and with abandon. What am I to do? Am I alone in my strife?