[Baalz]

I've run into this frequently while playing Marverni. Well, actually it may be a little different. I have a successful fight with few losses (no commanders lost, no routing) but all the troops for a commander are now unassigned. If I'm not paying very close attention said commander goes forward to attack the next province all by himself.

Happens with fair regularity with Marverni, but haven't seen it with any other nations.