Join your allies in an attempt to destroy the enemies that surround you. Some enemies such as turrets are in your shooting range and can be shot. Mortars must be fought the same as they are fighting you. This same method must be used to destroy the fortunately unaware cruisers, speeders, and guards within the walls. Good aim is needed for success. You may realize walls also block you from the 2nd half of the battlefield. Find the teleport to get to the other side.