Why did Spanish soldiers drown in gold during their desperate escape from Tenochtitlan?
In 1520, Hernán Cortés and his forces attempted a midnight breakout from the Aztec capital. Burdened by stolen treasure and trapped on narrow causeways, many soldiers met a watery end. This disastrous retreat, known as La Noche Triste, nearly destroyed the Spanish expedition and forever altered the conquest of Mexico.
By late June 1520, the Spanish position in Tenochtitlan had become untenable. After Pedro de Alvarado slaughtered Aztec nobles during a religious festival, the city rose in revolt. With the Aztec ruler Moctezuma II dead—killed either by his own people or the Spanish—and supplies of gunpowder and food dwindling, Cortés ordered a secret nighttime withdrawal. He chose the western causeway toward Tlacopan as the fastest route out of the island city, despite the danger of being discovered.
The escape began on July 1, 1520, under the cover of a rainstorm. However, the alarm was raised by Eagle Warriors, and the retreating army was swarmed by attackers in canoes and on the causeways. The situation turned catastrophic because many soldiers, blinded by greed, had packed themselves with as much gold and treasure as they could carry. This excess weight made it impossible to navigate the damaged bridges and obstacles, causing many to fall into the lake and drown during the chaotic fighting.
Casualty estimates for the event vary wildly among historical sources. Cortés claimed 154 Spaniards and over 2,000 native allies died, while others like Francisco López de Gómara estimated 450 Spaniards and 4,000 allies perished. The retreat resulted in the loss of all artillery and most horses. Despite the defeat, the survivors regrouped, eventually winning the Battle of Otumba one week later. This victory provided the respite necessary to reach Tlaxcala, where Cortés began planning the final siege and destruction of the Aztec Empire.
Source: La Noche Triste