Did you read my "Pontos Campain" thread?

I am at 217 BC and have both the Ptollies and the Seleukids on the run. If I were more aggressive, they would have been wiped out by now, but I use a defensive strategy. Of a total of 119 battles so far, I have lost 1, and that was very early. Even the formidable enemy elite phalanxes are chased off the field or wiped out. My frontier in the east is Arbela - Edessa - Damaskos - Sidon. In the West, maks are still holding two cities and form a nice buffer to KH, who have advanced to Byzantion.

If you want to have unbeatable armies, recruit phalanxes as mobile walls on the battlefield; many slingers (your best units by far) and horse archers where you can get them (Ani-Kamah is good). The offesive weapon is the slinger contingent. Get some chevrons and they are deadly. Horse archers are good for hitting enemies in the back and chasing after them. Phalanxes are good for shielding the slingers and leading enemy generals into. Other supporting units come in handy for chasing enemies and assaulting city walls.