To be perfectly honest, the exact working details of the campaign are still Timmy's best kept secret
In a nutshell though - you will be able to post battle results to any location your faction owns, or to adjacent ones. Battle scores raise your faction's control rating in that location. If a location's control rating tips to one side, it will become "contested" for a while. If your faction can hold on to its local superiority during the "contested" period, the location will then change hands and open up the way to attack other locations.