North Sea Mine Barrage

North Sea Mine Barrage
Part of the First World War

Map of the North Sea mine barrage
DateJune – 26 October 1918
Location
Belligerents
 Germany

The North Sea Mine Barrage, also known as the Northern Barrage, was a large minefield laid easterly from the Orkney Islands to Norway by the United States Navy (assisted by the Royal Navy) during the First World War. The objective was to inhibit the movement of U-boats from bases in Germany to the Atlantic shipping lanes bringing supplies to the British Isles. Rear Admiral Lewis Clinton-Baker, commanding the Royal Navy minelaying force, described the barrage as the "biggest mine planting stunt in the world's history".