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  2. Unrestricted submarine warfare - Wikipedia

    en.wikipedia.org/wiki/Unrestricted_submarine_warfare

    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 .

  3. 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]

  4. SM UB-10 - Wikipedia

    en.wikipedia.org/wiki/SM_UB-10

    SM UB-10 was a German Type UB I submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. . UB-10 was ordered in October 1914 and was laid down at the AG Weser shipyard in Bremen in November.

  5. Royal Navy during the First World War - Wikipedia

    en.wikipedia.org/wiki/Royal_Navy_during_the...

    At the beginning of the year, the German High Command had begun to resume unrestricted submarine warfare. By April, losses had increased to 545,282 tonnes of cargo. The Admiralty estimated that at this level, the war would end in defeat for Great Britain by November. To avert this danger, the convoy system was introduced in the same month. By ...

  6. SM U-66 - Wikipedia

    en.wikipedia.org/wiki/SM_U-66

    SM U-66 was the lead ship of the Type U-66 submarines or U-boats for the Imperial German Navy (German: Kaiserliche Marine) during World War I.The submarine had been laid down in Kiel in November 1913 as U-7, the lead ship of the U-7 class for the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine or K.u.K. Kriegsmarine).

  7. Mediterranean U-boat campaign of World War I - Wikipedia

    en.wikipedia.org/wiki/Mediterranean_U-boat...

    In January 1917, following the German decision to resume unrestricted submarine warfare, Foreign Secretary Arthur Zimmermann led a delegation to Vienna to secure the collaboration of Austria-Hungary. Grand Admiral Haus wholly supported the proposal, but Foreign Minister Count Ottokar Czernin had misgivings, as did the emperor, Charles I of ...

  8. 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.

  9. War Order No. 154 - Wikipedia

    en.wikipedia.org/wiki/War_Order_No._154

    The Kriegsmarine started World War II with Prize Rules which complied with Article 22 of the First London Naval Treaty.The Third Reich was indirectly bound to the Second London Naval Treaty of 1936 by the 1935 Anglo-German Naval Agreement and the Second London Naval Treaty affirmed that Article 22 of the 1930 treaty remained in force, and that "all other Powers [were invited] to express their ...