The Cagilan armies at least have been ordered to withdraw. Be patient.
As to the rest, I'm sure both Darka and BoM are waiting with bated breath to see what terms are offered to Eston. Doubtless both of those realms will be hoping to divine what sort of terms they can come to expect should they too decide to sue for peace.
You are assuming that Eston, Darka, and BoM will all get the same treatment. (Hint: They won't.)
How about we take every region north of the CE/Tara border and drive them rogue. Every single one except for the cities. Now, Make one duke per city each leader of their own realm. Let the land grab begin. Once a region is taken, you gain claim to that region.
It'll work itself out in a few weeks.
That's too much work. How about we just drive'em all rogue, and let ambitious young nobles take care of the rest?
Well kind of. I forgot the part where, each duchy has to send 1 member of its nobility to join CE as a knight each year in order to prevent war. If that knight leaves the realm another must be sent within a week or war commences.
You're forgetting the part where they fight to the death. That's pretty important too.
May the odds be ever in your favor!