OK, I'm good to go with playing as the Romans, Macedonians and Greeks. Parthia is my first Eastern faction. I've just finished conquering Armenia. Now, I'm at war with Pontus. I'm mad because I wanted to go after Seleucia. I really only have one full stack army and a half stack army. I'm playing RTR 5.4 on VH/VH. I'm doing well so far I think. Just some opinions is what I'm after. Would you all try to make peace with Pontus and then go after Seleucia or just take out Pontus first. My concerns are the Egyptians are in southern Asia Minor. When I played as Macedonia and invaded Pontus, the Egypptians attacked me. So, I'm thinking if I go at it with Pontus I'll have to deal with Egypt now. While I'm certain I could handle a one on one with Seleucids, I don't think I'm ready for a fight with both Pontus and Egypt. I think peace with Pontus would be better. That way I can take out the Seleucids who are also at war with Egypt. By the time I complete my land grab with Seleucia I'll be able to take on Egypt. Hopefully.
Combat with Parthia is much more fun than with the Romans and Macedonians. I used a very dispersed formation. I have no line at all. I divide my units into four groups. 3 groups of HA and Cats and 1 group of like two Sparabara which I leave in ambush somewhere. I attack the enemy from every which way. I've made units rout before they even get hit with one arrow. If I get a Horse archer to be chased by some ground units I lead them to my infantry in ambush and spring it on them. Best part is after I spring the ambush, I put those units back in the woods and do it again later.