Defending a medieval citadel from the onslaught of enemy hordes provides intense tactical battles in the Fortress Merge Tower Defense strategy. Buy towers of well-aimed archers and powerful magicians, place them wisely on the front line and combine identical buildings to increase fire, because the enemy first storms the defensive lines. Repel the attacks of infantry, men-at-arms, cavalry and war elephants, repel all advancing waves and unlock the next stages of the campaign in Fortress Merge Tower Defense.