Sid Meier's Civilization IV: Defenders of the Gates

Play as one of 4 different cultures and build defensive turrets to repel wave after wave of vicious Hun enemies in this tower defense game based in the popular Sid Meier’s franchise. Place turrets in strategic locations on the enemy path to inflict the most damage. Earn gold for every defeated enemy-use it to buy, repair, and upgrade your defenses. Protect your citizens throughout the ages to become the most powerful civilization in history!