Cortes & Pizarro were the Spanish conquistadors.
Cortez: in 1519 conquered the Aztec empire and left it in ruins and were the first Europeans to find the Mayan ruins.
Pizarro: encouraged by Cortez's success conquered the Incas empire with a small army in 1531. took them one year.
Note: a reason why both lost easily is because of plague witch killed millions; and the Inca empire had recently drained all military force in a civil war