Cool, still, I had an extremely powerful army, could crush anyone who attacked me, also, I won a battle 27(me) against 181(enemy), and I won, they were completely obliterated and I had 16 troops left!
All I did to achieve that victory was to out-manoeuvre the enemy and strike them in the sides, phalanx formations are absolutely deadly, I always surround them, with peasants attacking the front so they don't turn and reform.
You have to develop different battle tactic and very fast, just notice what the enemy is doing and what they are going to do, and then defend against possible enemy attacks, if cavalry are approaching some of your legionaries, then you need to get them in the testudo(I think that's the word used...) formation, so they take the least amount of casualties from the charge.