Age of Empires II: The Conquerors/The Triple Alliance

Objectives

 * 1) Deliver the summons of war to the Texcoco Town Center.
 * 2) Deliver the summons of war to the Tlacopa Town Center.
 * 3) Defeat the Tlaxcalans by destroying 4 Town Centers.
 * 4) Defeat your former allies, the Tlacopan and Texcoco.

Map
Available on the Steam website.

Walkthrough
You must first deliver the summons of war to your two allies (i.e. going to their town center). After that, you have to destroy 4 Town Centers of Tlaxcala.

The thing to know is as soon as you'll destroy the 4 Town Centers, your allies will turn against you, and you'll have top defeat them also. In fact, it is better to attack your allies before defeating Tlaxcala to have the element of surprise.