Battle of Vilcapugiou
1813 CE.
Shown on the map at -19.039°, -66.559°.
The Battle of Vilcapugio (Quechua: Sacred Well) was a major battle fought on October 1, 1813, during the second Campaign of Upper Peru in the Argentine War of Independence, where the United Provinces forces led by General Manuel Belgrano were defeated by a royalist army, led by Joaquin de la Pezuela.
Text from the Wikipedia article Battle of Vilcapugio, licensed CC BY-SA 4.0.