Provinces have been made more influential, with key settlements within your regions that cannot defend themselves. If an enemy army invades your lands, they can take key strategic settlements such as, farms that supply your armies with food, when that is lost, and you do not have enough reserves, your men will begin to starve. Mines, that supply you with the coin to pay your armies, if men are not paid their swords are not yours. When you take one of these settlements you then take the surrounding lands with it, and you can garrison your troops inside, which will grant you replenishment from the local region. This now gives you the opportunity to (instead of having to siege your enemy and losing a lot of men) take away their coin and food, and watch as their army melts away.