Well in my curent game they aren't doing that.Instead they took antioch but let it become rebel,so I re-took it with a force that could repel them if they decided to take it again,then they decided to make a move of one of my freshly taken towns,which they promptly decided against when I reinforced the garrison with more trrops from one of my fortresses.Right now they are wandering between Trezibond and Antioch back and forth while they make up their minds what to do.