Battle of Korsakov
1904 CE.
Shown on the map at 46.833°, 143.000°.
The Battle of Korsakov, a naval engagement of the Russo-Japanese War, was fought on 20 August 1904 off the southern coast of Sakhalin island. The battle foiled an attempt by the Imperial Russian Navy protected cruiser Novik at escaping Port Arthur to join the Russian cruiser squadron at Vladivostok, Russia, after the Russian Pacific Squadron was scattered in the Battle of the Yellow Sea.
Text from the Wikipedia article Battle of Korsakov, licensed CC BY-SA 4.0.