Battle of Ensenada
1828 CE.
Shown on the map at -34.817°, -57.900°.
The Battle of Ponta de Santiago was a minor naval battle fought in January 1828 during the Cisplatine War. An Argentine flotilla, under Admiral William Brown, was intercepted by some Brazilian ships which were blockading Buenos Aires, but there were no ships sunk on either side before the Argentines managed to withdraw back to port.
Text from the Wikipedia article Battle of Ponta de Santiago, licensed CC BY-SA 4.0.