Battle of Moquegua
1823 CE.
Shown on the map at -17.200°, -70.933°.
The Battle of Moquegua (or Moquehua) took place during the Peruvian War of Independence on 21 January 1823 around the city of Moquegua, between the Liberation Army of Peru, under command of Argentinean General Rudecindo Alvarado, and the Royal Army of Peru under General José de Canterac. The army of the Patriots was almost completely destroyed.
Text from the Wikipedia article Battle of Moquegua, licensed CC BY-SA 4.0.