Battle of Yavi
1816 CE.
Shown on the map at -22.132°, -65.463°.
The Battle of Yavi (also called "the Surprise at Yavi") took place on 15 November 1816, and was one of the military battles to obtain Argentina's independence from Spain, but ended in defeat.
Text from the Wikipedia article Battle of Yavi, licensed CC BY-SA 4.0.