Strictly speaking, in my opinion at least, units should also be nonresponsive to any orders when engaged in combat as well. They´re fighting for their life, after all, and then this fellow in charge (the player) tells them to turn the back to the enemy? It´s especially an issue with cavalry, you can crash it in the rear of an enemy, pull back, crash again... Normally, I´d expect them to crash in once and then slug it out, killing ( or rather routing) the enemy or die trying. I can´t even start to count the battles I´ve won with this "cheat".