Hey, I've been playing as the koinon Hellenes and recently sent a small force via sea to the Crimea area.

The sauromatians (Sp?) owned the left hand city on the penninsula and they were my allies, so i thought i'd just take the other city ( i wanted to get some interesting mercs).

Anyway, as my army approached with my young spartan general who had just settled matters with the selucides and got pontis to become a protectorate, the sauromatian city changed to koinon hellenes and had my troops in it before i even landed and forces, there wasn't even any messages saying anything.

How often does this happen? Was it just a rebellion and because i was close they decided to go with me?

Cheers for any replys.