Hehehe.....that's the kind of mentality for HA factions Hit 'em hard and move on.......

IMO, it's better to leave the Parthians in Campus Sakae alone unless you plan on sacking it and moving on. In fact, after several years, I leave Campus Alanni (after destroying all the buildings) and the resulting rebel stack is more than enough to keep the Parthians busy. That army, along with mercs recruited along the way head for Chersonesos, a far more valuable settlement with it's Black Sea port, and much closer to the capital, which I eventually move to Tylis. I also abandon the northern most settlement, Campus Sarmatae, for similar reasons as Alanni....too far from the capital to maintain law and order without buildings that help. It's poor in resources, anyways.

Anyways, good luck!