In that case, however, conquistadores contributed nothing directly to the societies' destruction; Eurasian germs, spreading in advance, did everything.
Francisco Pizarro and his small group of conquistadors stunned the king’s much larger force with guns and horses, neither of which they had seen before.
The Aztecs formed out of an alliance of three major cities in modern day Mexico in about 1430, just 89 years before Cortez and his conquistadors showed up.
When the Spanish conquistadors came to the New World, they brought horses, which had been extinct in the Western Hemisphere since the end of the last ice age.