The answer was the Battle of Jutland

Map of the Battle of Jutland — Map: Grandiose (labels removed), CC BY-SA 3.0, via Wikimedia Commons.

Year: 1916
Where: North Sea, near Denmark
War: World War I
Sides: United Kingdom of Great Britain and Ireland vs German Empire
Troops: about 100,000
Casualties: about 10,003

The Battle of Jutland (German: Skagerrakschlacht, lit. 'Battle of the Skagerrak') was a naval battle between Britain's Royal Navy Grand Fleet, under Admiral Sir John Jellicoe, and the Imperial German Navy's High Seas Fleet, under Vice-Admiral Reinhard Scheer, during the First World War. The battle unfolded in extensive manoeuvring and three main engagements from 31 May to 1 June 1916, off the North Sea coast of Denmark's Jutland Peninsula.

From Wikipedia, under CC BY-SA.

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