On the maps are several Control Points which you are to capture by repairing them. When such a point has been captured your team will gain 1 capture-point per second, each map has its own points requirement for winning the game, the more control points you capture the faster you reach the requirement and win the game.
An editor shot of the map DOM_GDI_Base based on the SP Map Tutorial from Westwood Studios. There will be a total of 9 Control Points on this map. Inside the buildings and outside.
AGT will owned all the nods :D