I have recognized a simple tactic that helps sometimes if you have strong archers. First when you are facing the enemy you bring your archers out and shoot (with fire). The opposing army usually stands there or advances. After you archers have fired a lot, perform a full scale attack with your army and the opposing army will most likely flee or not fight good since their morale goes down after the archer raid. I have doen this against armies that were 2 times bigger than mine and I still won. (I play on hard so dont think it only work for Easy)