In one petty battle, when exerting a "police action" against rebels, I employed the usual tactics of standing in a circle and shooting arrows at the unit of feudal sergeants. I was baiting them with a steppe cavalry which was my leaders unit. So I kept running from them while the rest of the army peppered arrows (the two units of bulgarian brigands were quite effective on that :)) The enemy unit was down to 40something when

my leader run and quit the battle...

Of course I won the day the other units did not even waver... But this was stange. My leader unit did not even stop and I could not rally them even though I was far away from my end of the battlefield (it ran through the bridge all the way to the other end...) Stange. I will check but I am pretty sure the unit got some bad vice because of this...