EB.

800 Elite Armenian Cavalry (400 HAs, 200 Cataphract/weak general cav, 200 medium/skirmisher cav) and 720 infantry (cheap Celtic mercs)

against

4,600 highly elite mixed Greek Phalangites and heavy infantry and cavalry.

Ended up with the loss of just about all the infantry and 600 of the cavalry dead in exchange for all of the Greeks.