Age of Empires II: The Conquerors Expansion includes four new historically based campaigns. These focus on historical figures such as Attila the Hun, El Cid and Montezuma, allowing players to ride alongside the Hun invasion of Europe, battle the Moors in Spain, preside over the siege of Tenochtitlan, or relive eight other battles that became turning points in history, such as Agincourt, Manzikert and Hastings, with such conquerors as Henry V, Yi Sun-shin and Erik the Red.

Barbarian hordes feast on the dying Roman Empire. The most dangerous of these invaders are the Huns, and their ferocious king, Attila. After pouring out of the Caspian steppes, looting and burning all the while, the Huns become so powerful that the Roman Empire is forced to pay a tribute to Attila. But the king of the Huns is still not satisfied, and he mobilizes his horsemen to invade Gaul and eventually Rome itself! Can nothing stop the brutal Attila?

Certain names ring down through history; men and women who shaped the world. Some were forces of chaos, destructive and rapacious. Some were men of honor who fought for the right. Some defended their homelands from invaders, while others used their military might to violently acquire the lands of others. Battles such as Agincourt, Manzikert, and Hastings are remembered as turning points in the world history, and names such as Henry V, Yi Sun-shin, and Erik the Red are etched forever as great conquerors. Now relive their tragedies and triumphs.

Spain is divided between Christian kingdoms to the north and Moorish kingdoms to the south. In the barren borderlands of Castille, Rodrigo Diaz, called El Cid, gains notoriety as a brilliant general and heroic crusader. The Cid is so popular among soldier and peasant alike that the distrustful King of Castille sends him into exile. The Cid must join forces with his former enemies, the Moors, and fight against his beloved Castille. But an even greater threat waits across the sea in Africa, where fanatical Berber horsemen are eager to seize what the Moors could not.

Centuries of conquest have allowed the Aztecs to become the mightiest empire in Central America. But when strangers appear on the shores of the Caribbean Sea, Montezuma, emperor of the Aztecs, is unsure whether they are conquerors...or gods. Can a vast empire of warriors using obsidian spears and cotton armor hold off mounted invaders armed with metal armor and gunpowder? Will the Aztecs island-city of Tenochtitlan continue to conquer the Americas, or will it crumble beneath these foreign conquerors?