The Atlantic U-boat campaign of World War I was the prolonged naval conflict between German submarines and the Allied navies in Atlantic waters –the North Sea, the seas around the British Isles, and t
A German postcard depicting the U-boat SM U-20 sinking RMS Lusitania
German U-boats at Kiel, February 1914
The sinking of HMS Pathfinder by SM U-21 on 5 September 1914
German depiction of the sinking of HMS Formidable by SM U-24
Convoys in World War I
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The convoy—a group of merchantmen or troopships traveling together with a naval escort—was revived during World War I, after having been discarded at the start of the Age of Steam. Although convoys we
A transatlantic convoy approaching Brest on 1 November 1918. Photograph taken from aboard USS Rambler.
Tonnage of British and neutral shipping lost in 1917 and 1918, showing failure of unrestricted U-boat warfare. The German admiralty's target was only reached in the first few months, although it grossly overestimated its successes.