Unlock the following medals by performing the corresponding tasks:
MEDAL : HOW TO UNLOCK Assassin - Kill 100 Giants. Elder - Play the game for 10 hours. Leader Of Men - Fight a battle for 60 minutes or longer. Lidless Eye - Conquer Middle-earth in Campaign Mode. Lord Of The Rings - Unlock everything. Public Enemy #1 - Kill a total of 1000 enemies. War Master - Use your most powerful attacks 500 times.
The archer and the mage are better at killing ents and trolls because they have ranged attacks. When you are a warrior press Y to knock over enemies (this works best on archers). When you are a troll fighting a ent (or vice versa) don't stop pressing B. If you keep doing this they can't get any attacks in.