@Ludens - The Seleucids faced rebellions and wars everywhere so maybe the Parthians took a chance and succeeded even when their military was no match.

@mikeprettyrtw - Nah, I never have trouble facing parthians anymore. With realistic Movement mod, I can avoid their field armies and take both their cities wiping them out in 3 seasons. So winter 272 BC = no more Parthians

Of course they should be disadvantaged, only rebelled in 238 and against the regions largest empire as you said.

By tribal I was thing along the lines of their BGs, archers and armoured horse archers (but not too armoured). Still moderately effective

Against AI they wouldnt be too bad would they?? Didnt they change it so horse archers do better in auto calc?? I mean Sarmatians usually gather a huge empire very early on and their cavalry has barely any armour in the beginning