Battle of Río de Oro
1914 CE.
Shown on the map at 23.722°, -15.935°.
The Battle of Río de Oro was a single-ship action fought in August 1914 during the First World War, when HMS Highflyer attacked the German SS Kaiser Wilhelm der Grosse off Río de Oro on the coast of Northwest Africa.
Text from the Wikipedia article Sinking of SS Kaiser Wilhelm der Grosse, licensed CC BY-SA 4.0.