Having trouble with late game

Im 13 years into my first campaign and ive sided with the Vlandians. I own Battania and the Western Empire while Durdurt owns everything to my west. My problem is hopping from castle to castle fending off 2k sized armies only for the enemy to beg for peace while the next faction declares war and sends their wave. Ive spent the last 3 years in game walking back and forth between my northern empire and southeast empire borders fighting off castle sieges and there seems to be no end. Durtdurt is no help whatsoever, he keeps sending his army down south often walking right past my besieged castles. The second i push into enemy territory a siege starts up north and if i take the city then go to defend it, another clan goes to war and takes the newly acquired territory. Does anyone know what i should be doing at this point? Whenever they beg for peace after we stomp them, Durtdurt goes to war with them again 3 days later. Should i use the diplomacy mod and section off to do non aggression acts? ive been trying to keep it vanilla :c

submitted by /u/Sillvah27
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