As explorations to America got more and more common, he asked the queen for money to go to Mexico, and find the aztecs and fight for treasures and the empire. The queen agreed as long as he won the fight.
He made a group of about 300 spaniard soldiers and set sail to Mexico. When he got to Mexico, he ran into trouble. The king of the Aztecs was too nice, so they captured him.
When the Aztecs learned that he captured the King, they went to war. I lasted 30 days and won the war. They took the riches and left.