Quote Originally Posted by NeoSpartan
But I can't get the factions I AM BEATING UP to accept a ceasefire.
A matter of timing really. You take some of their settlements, beat a large quantity of armies, in fact so much that there are no standing armies left in the region and that the garrisons are minimal. Then you ask them for a ceasefire - either after a bit of negotiating about the amount of money you'll have to pay, or immediately they will accept.