The official "Art of Defense Fans" group for all our Real Time Strategy gamers our there that love to play Cooperative Art of Defense or Tower Defense maps in games such as Command & Conquer Tiberium Wars, Generals, Generals Zero Hour, Age of Empires II HD, Age of Empires III and others.
Here a few screenshots of the maps Forest Assault, Incoming AOD and Tiberium Grounds. Excellent Art of Defense maps.