The fourth campaign, Battles of the Conquerors, is actually a group of unrelated single scenarios, each based on a significant historical battle. These are based on Attila the Hun's rise to power, Montezuma's defense against Hernan Cortez, and the adventures of El Cid. The Conquerors adds four additional single player campaigns. Chat commands are introduced in order to communicate more effectively with allied computer players. Additionally, an in-game option has been added to allow the game to automatically replenish Farms after they are exhausted. Villagers will now automatically start gathering resources if they build resource gathering sites, while siege weapons will not fire if their attack is likely to harm friendly units (though it may not seem like it). Micromanagement is made easier by an improved scripted artificial intelligence of Villagers and siege weapons. Also, infantry are able to garrison in rams, increasing their attack and speed, while ships are able to form formations in order to fight more effectively. New maps were also included which are based on real life geographic locations and new winter and tropical terrain.

The Conquerors has new gameplay features and changes such as the game modes Defend the Wonder, King of the Hill, and Wonder Race.

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