Funny. I always have the same issue with the Romans when playing as Parthia. Or Pontos. I believe it's a combination of two factors:
firstly, the RTW AI's inherent desire to expand northward (which is utterly absurd for all factions except Egypt and Carthage and maybe Pontos. I'd really like to know why CA programmed a Roman-centric game that way). This makes AI Parthia stay in the steppes and AI Rome try to conquer the Alps. Also, it boosts their southern competitors (AS or, in Rome's case, Carthage),
and secondly, those goddamned pikemen who'll win every autoresolve battle. Carthage has them, too, and the Carthaginian AI loves to spam them. Note: If you hate fighting battles by hand, just recruit a fullstack of Chaonion Agema and autoresolve everthing. Not even Satres will manage to overcome this.
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