I didnt notice this until recently but every time I get the "Heathens are Splintered, white Peace is possible" event fires and I accept white peace.
Now as I understand it, all vassels are supposed to make peace when I do, but for some reason when I use this event the vassels do not make peace.
Now as I understand it, all vassels are supposed to make peace when I do, but for some reason when I use this event the vassels do not make peace.