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  1. U-boat - Wikipedia

    In World War I, Germany intermittently waged unrestricted submarine warfare against the UK: a first campaign in 1915 was abandoned after strong protests from the US but in February 1917 …

  2. Warfare Under the Waves – Submarines in the First World War

    Sep 27, 2017 · Submarines were among the important new technologies that came to the fore during WWI. Although work on submarines had been underway for decades, it was the first …

  3. 10 Facts About Submarine Warfare in World War One - History …

    Aug 15, 2018 · Effective submarine warfare was a particularly new phenomenon, with Germany focusing on U-Boat production to counter the larger British surface fleet and put pressure on …

  4. The Submarine War Of The First World War | Imperial War …

    Both the British and German navies made use of their submarines against enemy warships from the outset. Franz Becker commanded German submarines – known as U-boats – from 1915. …

  5. U-boat | German Submarine Warfare in WWI & WWII | Britannica

    Nov 9, 2025 · At the outset of World War I, German U-boats, though numbering only 38, achieved notable successes against British warships; but because of the reactions of neutral powers …

  6. U-Boat: Germany's Submarines of WWI & WWII - World History ...

    May 21, 2025 · When WWI began in 1914, the German Imperial Navy had only 20 operational submarines or Unterseeboots (undersea boats), as they were known, a name soon shortened …

  7. The Use of Submarines in World War I - usahistorytimeline.com

    Explore the pivotal role of submarines in World War I, their technological advancements, and impact on naval strategies and warfare.