The story of the Advance Wars campaign begins with the nation of Orange Star in a war against the neighboring country of Blue Moon. As a tactical adviser for Orange Star, the player follows the war effort through all four countries over the course of the game. In the end, it is revealed that the enigmatic Black Hole Army, under the command of Sturm, is the true enemy. Using a CO doppelganger clone of Andy, Sturm stirred up war among the four countries in order to confuse, weaken, and eventually conquer them. Once this is revealed, the four countries unite to drive Black Hole out of their land. Along the way the player gains access to three COs; Andy, Max and Sami. In the final battle of the game the allied COs can vary, based on certain choices made and battles fought.