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  2. Unrestricted submarine warfare - Wikipedia

    en.wikipedia.org/wiki/Unrestricted_submarine_warfare

    German U-boat U-14 (early 1910s) Unrestricted submarine warfare is a type of naval warfare in which submarines sink merchant ships such as freighters and tankers without warning. The use of unrestricted submarine warfare has had significant impacts on international relations in regards to both the First World War and the Second World War. Its ...

  3. U-boat campaign - Wikipedia

    en.wikipedia.org/wiki/U-boat_campaign

    In six months of unrestricted submarine warfare U-boats sank 3 ⁄ 4 million tons of Allied shipping, scarcely denting the British merchant fleet; whilst new building, and additions from ships seized, had more than made up this loss. On the other hand, serious offence had been given to neutrals such as Norway and the Netherlands, and brought ...

  4. U-boat - Wikipedia

    en.wikipedia.org/wiki/U-boat

    U-995, a typical VIIC/41 U-boat on display at the Laboe Naval Memorial. U-boats were naval submarines operated by Germany, particularly in the First and Second World Wars.The term is an anglicized version of the German word U-Boot ⓘ, a shortening of Unterseeboot (under-sea boat), though the German term refers to any submarine.

  5. Defensively equipped merchant ship - Wikipedia

    en.wikipedia.org/wiki/Defensively_equipped...

    The United States responded to unrestricted submarine warfare by severing diplomatic relations with Germany on 3 February 1917. A filibuster in the United States Senate temporarily delayed President Woodrow Wilson 's proposal on 26 February 1917 to arm United States merchant ships, but arming started in March under an executive order .

  6. Sunken Nazi German U-boat clearly visible for first time - AOL

    www.aol.com/news/2014-07-18-sunken-nazi-german-u...

    A Navy ship escorting the passenger boat then sank the submarine U-166 by dropping depth charges –– killing all 52 German sailors. WTVT reports a team of scientists under Robert Ballard, ...

  7. 9 January 1917 German Crown Council meeting - Wikipedia

    en.wikipedia.org/wiki/9_January_1917_German...

    It had been a Crown Council of 31 May 1915 that had ended the first phase of unrestricted submarine warfare, one at Potsdam on 21 December had decided on the Verdun Offensive and one in March 1916 had permitted U-boat commanders to attack Allied merchant vessels without warning, whilst sparing passenger liners and neutral vessels. [7] [8] [9]

  8. Atlantic U-boat campaign of World War I - Wikipedia

    en.wikipedia.org/wiki/Atlantic_U-boat_campaign...

    The Atlantic U-boat campaign of World War I (sometimes called the "First Battle of the Atlantic", in reference to the World War II campaign of that name) was the prolonged naval conflict between German submarines and the Allied navies in Atlantic waters—the seas around the British Isles, the North Sea and the coast of France.

  9. Henning von Holtzendorff - Wikipedia

    en.wikipedia.org/wiki/Henning_von_Holtzendorff

    Henning Rudolf Adolf Karl von Holtzendorff (9 January 1853 – 7 June 1919) was a German admiral during World War I, who became famous for his December 1916 memo about unrestricted submarine warfare against the United Kingdom.