Battle of 4 May
1823 CE.
Shown on the map at -13.050°, -38.420°.
The Battle of 4 May was fought in open sea near Salvador, Bahia, on 4 May 1823, between the Imperial Brazilian Navy, under the command of British admiral Thomas Cochrane, and the Portuguese Navy during the Brazilian War of Independence.
Text from the Wikipedia article Battle of 4 May, licensed CC BY-SA 4.0.