Battle of Moon Sound
1917 CE.
Shown on the map at 58.601°, 23.450°.
The Battle of Moon Sound was a naval battle fought between the forces of the German Empire, and the Russian Republic (and three British submarines) in the Baltic Sea during Operation Albion from 16 October 1917 until 3 November 1917 during World War I. The German intention was to destroy the Russian forces and occupy the West Estonian Archipelago, and achieved both objectives. The Imperial German Navy had ten battleships, one battlecruiser, nine light cruisers, one mine cruiser, fifty destroyers and six submarines while the Russians had only two pre-dreadnoughts, three cruisers, three gunboats, twenty-one destroyers, and three British submarines.
Text from the Wikipedia article Battle of Moon Sound, licensed CC BY-SA 4.0.