Ixtlilxóchitl's Texcocan army at Tenochtitlan's fall
After losing the Texcocan succession to his brother Cacama, whom Moctezuma backed, the prince Ixtlilxóchitl allied with Cortés, was baptized as Hernando, and brought Texcoco's forces to the Spanish side. The book uses this case to argue that a dynastic dispute inside the Aztec Triple Alliance, not Spanish arms alone, brought down Tenochtitlan.