Battle of Portada de Guías
1838 CE.
Shown on the map at -12.060°, -77.037°.
The Battle of Portada de Guías (Spanish: Batalla de Portada de Guías), also known as the Battle of Guía (Spanish: Batalla de Guía) or Battle of Piñonate (Spanish: Batalla de Piñonate), took place between the Chilean Army and the secessionist Peruvian Republic in 1838, during the War of the Confederation.
Text from the Wikipedia article Battle of Portada de Guías, licensed CC BY-SA 4.0.