Includes leaders for the new civs and additional leaders for existing ones, such as Stalin (Russia) and Churchill (England).
To further distinguish civilizations, every civ received a Unique Building that replaces a standard one (e.g., the Zulu "Ikhanda" replaces the Barracks), providing specialized bonuses. New Civilizations and Leaders: Sid Meier's Civilization IV: Warlords
A new diplomatic mechanic where players can subjugate other civilizations or offer themselves as a vassal. Vassals provide tribute and support their masters in war but may secede if they regain enough power. Includes leaders for the new civs and additional
Released in July 2006, is the first expansion pack for Civilization IV , primarily focused on enhancing the military and diplomatic aspects of the game. Key Gameplay Features the Zulu "Ikhanda" replaces the Barracks)