Why did a few hundred spaniards defeat the aztec empire

Smallpox demoralized the Aztecs and they gave up on pursuing the Spanish after the Noche Triste. Cortes establishes a relationship with the locals, he also engaged the Indians people, for example, Tlaxcalans and he created an army. The Aztecs conducted human sacrifices of about ten thousand to fifty thousand people annually thus killing of people were fairly common to nourish the sun and the gods and in this case, the Spaniards were seen as gods. Advantages of Spaniards The Spaniards had horses, gunpowder and they were immune to diseases. Horses were used in Europe for war and horses were used to chase retreating enemies. The Indians were vulnerable since the Spanish had a low risk of death as they protected themselves using their weapons.