Urban Warfare is one of the many free mmo browser based war games you’ll find on Facebook and it’s also a city builder. The goal in the game is to build a city like you would do in a game such as Social City but you also train an army of soldiers to battle other Facebook players. You have residences for population, structures that make you coins, and barracks to train your army in. You can build defensive structures and at late levels, factories. The game does a good job combining the city building genre with combat.