Final answer:
Cortez was the first conquistador to introduce cannons in his conquest against the Aztecs. These, along with steel swords and metal armor, were key to the Spanish success despite being outnumbered. Cannons played a significant role in the conquest of the Aztecs.
Step-by-step explanation:
Hernán Cortés was the first conquistador to introduce cannons as part of his weaponry in the conquest of the Aztecs. Although Crossbows and firearms were known in Europe at the time, and soldiers often became emotionally attached to their swords,
it was the use of cannons that played a significant role in the Spanish conquest. Cortés and his men, despite being outnumbered, used military tactics and superior weaponry, including steel swords, metal armor, horses, and a few cannons, to defeat the Aztecs by 1521.