What was the sad night for Cortez?

The "sad night" for Hernán Cortés refers to the events surrounding the fall of Tenochtitlan in 1521 when he and his forces faced significant resistance from the Aztecs. After initially conquering the city, the Spanish were besieged and suffered heavy losses during their retreat in what is known as La Noche Triste ("The Sad Night") in July 1520. Many Spaniards and their allies were killed, and Cortés experienced a profound sense of loss and defeat. This night marked a turning point in the Spanish conquest of the Aztec Empire, illustrating the challenges of their campaign.