First Battle of Svensksund
1789 CE.
Shown on the map at 60.450°, 26.990°.
The First Battle of Svensksund, also known as the First Battle of Rochensalm, was a naval battle fought in the Gulf of Finland in the Baltic Sea outside the present-day city of Kotka on 24 August 1789 during the Russo-Swedish War.
Text from the Wikipedia article Battle of Svensksund (1789), licensed CC BY-SA 4.0.