Battle of the Echinades
321 BCE.
Shown on the map at 38.304°, 21.111°.
The Battle of the Echinades was one of the naval battles of the Lamian War (323–322 BC), fought between the Macedonian navy under Cleitus the White and the Athenian navy.
Text from the Wikipedia article Battle of the Echinades (322 BC), licensed CC BY-SA 4.0.