I found the Getai to be quite loyal, actually. Only once they had lost their war against the Romans did they actually turn on me, and by then I'd managed to fortify my towns pretty well.
What you'll want to do is head north and take Sardika and all of those cities. Upgrade the walls to Large Stone Walls or better, and pack the towns with archers. The enemy will only be able to make rams and towers, which you can burn down with your archers. It's a pretty failsafe defense.
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