User blog comment:Longdead97/Ulfric's war effort & gaining support. Smart move or no?/@comment-6881629-20130323103701

The brute strength of the Stormcloaks and the witchcraft of the Forsworn would make a powerful army but as TheBlackOmen said there's to much bad blood between them. Also the reason behind the Stormcloaks is to drive out anyone who isn't "true" Nord (i know a player can join them with any race but thats just for the sake of the game) and the Forsworn are Bretons. I don't think the Forsworn would tolerate serving Ulfric to get back the land that was their's in the first place anyway so it would never happen.