Battle of Sarandí
1825 CE.
Shown on the map at -33.671°, -56.291°.
The Battle of Sarandí was fought on 12 October 1825, in the vicinity of the Arroyo Sarandí in Uruguay, between troops of the Banda Oriental (now Uruguay) and the Empire of Brazil. It resulted in a decisive victory for the Orientals.
Text from the Wikipedia article Battle of Sarandí, licensed CC BY-SA 4.0.