Burning the Ships, Cutting Off Retreat
After landing on the coast of Mexico, Cortés by tradition ordered his own ships scuttled or burned, cutting off any possibility of his men shrinking from battle and returning to Cuba, forcing the whole expedition to burn its boats and press on inland — this extreme display of resolve was thereafter widely cited as a historical example of the decision-making strategy of "leaving oneself no retreat and going all in."
The Fall of Tenochtitlan
Cortés exploited the deep resentment of the oppressed vassal tribes within the Aztec Empire (such as the Tlaxcalans) toward Aztec rule, allying with them to attack together, while the smallpox virus the Europeans unwittingly carried spread on a great scale among a native population lacking immunity, causing terrible loss of life; in 1521 Cortés’s allied force at last took the Aztec capital Tenochtitlan, the last emperor Cuauhtémoc was captured, and this once-prosperous city in the lake was thereafter razed to ruins, on which present-day Mexico City was built.