Well I’ve had a few where even out numbered before the start of mayhem; I'd maneuvered one unit (i.e. HR) into a position up hill and behind my adversary only to watch them withdraw from battle without a single shot fired.
That usually happens when I'm really looking for a fight. Then when I hit end year "just one more time", bang you get slammed by a 3,000 strong, 2 hr battle.