On January 12, 1519, Hernán Cortés left Santiago de Cuba with roughly 500 men, 11 ships, and 16 horses despite orders revoking his command. His unauthorized voyage set in motion the conquest of the Aztec Empire, one of history's most consequential and brutal collisions between civilizations.
Cortés had been stripped of his commission by the governor of Cuba, Diego Velázquez, who grew suspicious of his ambition at the last moment. Rather than comply, Cortés simply left early, sailing into the dawn before soldiers could stop him. It was an act of open mutiny that would define the rest of his career.
The fleet carried a strange assortment of instruments for a war of conquest: priests for conversion, horses never before seen in Mesoamerica, and cannon that would shatter the psychological confidence of indigenous armies. Within two years, Tenochtitlan, one of the largest cities on Earth, lay in ruins.
What began as a defiance of bureaucratic authority became the opening act of Spain's American empire, unleashing waves of disease, forced labor, and cultural destruction that reshaped the Western Hemisphere permanently.
Key people: Hernán Cortés, Diego Velázquez