Dunno if its a bug (or a known bug) but i noticed something while i was playing with Bannor (& Order). I attacked with a stacked bunch of Macemen (Str 7), Crusaders (Str 6) and Adepts and scorched every square i could but when enemy counterattacked something annoying happened. Everytime (ranger, tiger or crossbowmen) they attacked (Malakim & Leaf) the macemen defended. Even when they had only 1 str left. Seemed like game didnt allow for the better (in that situation) Crusaders to defend at all. So ai hunted down all my three 30+ exp point macemen and there was nothing i could do about it.
EDIT: and i know about the 'guardmen' promotion... but still it feels rather odd to me.