Battle of Ingavi
1841 CE.
Shown on the map at -16.757°, -68.331°.
The Battle of Ingavi was fought on 18 November 1841, near Viacha, during the Peruvian–Bolivian War of 1841–1842. The Bolivian Army under the command of José Ballivián repelled the invading Peruvian Army commanded by Agustín Gamarra, who was killed in action. Ingavi was the decisive engagement that prevented Peruvian annexation and secured Bolivian independence.
Text from the Wikipedia article Battle of Ingavi, licensed CC BY-SA 4.0.