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U-boat campaign

BelligerentsRoyal NavyRoyal Canadian NavyFrench NavyRegia MarinaUnited States NavyImperial Japanese NavyBrazilian NavyImperial Russian NavyRoyal Romanian NavyImperial German NavyAustro-Hungarian NavyBulgarian NavyCommanders and leadersLord FisherSir Henry JacksonSir John JellicoeSir Rosslyn WemyssHugo von PohlGustav BachmannHenning von HoltzendorffReinhard ScheerStrength ~500 Royal Navy destroyers~250 US destroyersVarious armed trawlers and smaller vesselsDefensively armed merchant ships366 Q-ships 351 U-boatsCasualties and losses 5,000 merchant ships sunk15,000 merchant sailors killed104 warships sunk42 warships damaged61 Q-ships sunk 217 U-boats lost to all causes6,000 sailors killedThe U-boat campaign from 1914 to 1918 was the World War Inaval campaign fought by German U-boats against the trade routes of the Allies, largely in the seas around the British Isles and in the , as part of a mutual blockade between the German Empire and the United Kingdom.

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