Battle of Marihueñu
1554 CE.
Shown on the map at -37.131°, -73.169°.
The Battle of Marihueñu was one of the early decisive battles of the Arauco War; it took place between the Mapuche leader Lautaro and the Spanish general Francisco de Villagra on 23 February 1554.
Text from the Wikipedia article Battle of Marihueñu, licensed CC BY-SA 4.0.