La Noche Triste
1520 CE.
Shown on the map at 30.664°, -109.235°.
La Noche Triste ("The Night of Sorrows", literally "The Sad Night"), officially called in Mexico Victorious Night, was an important event during the Spanish conquest of the Aztec Empire, where Hernán Cortés and his army of Spanish conquistadors, including their native allies were driven out of the Mexica capital, Tenochtitlan.
Text from the Wikipedia article La Noche Triste, licensed CC BY-SA 4.0.