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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. U-boat campaign - Wikipedia

    en.wikipedia.org/wiki/U-boat_campaign

    The heaviest losses were suffered after unrestricted submarine warfare was resumed in February 1917, before the British began full-scale convoying in September 1917. 150,000 tons of purely British shipping were lost in January 1917, and 300,000 tons in February; Allied and neutral losses increased in a similar proportion.

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

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

    1916 was a year of political struggles between opponents and proponents of unrestricted submarine warfare. Reinhard Scheer became the commander of the High Seas Fleet, and as an effort to "blackmail" command into adopting unrestricted submarine warfare, refused to use his submarines in any sort of limited commerce raiding campaign. [23]

  6. 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 ...

  7. Blockade of Germany (1914–1919) - Wikipedia

    en.wikipedia.org/wiki/Blockade_of_Germany_(1914...

    Things only worsened with the February 1917 German declaration of unrestricted submarine warfare (which meant a loss of neutral tonnage, both through ships sunk and Allied requisition of vessels) and the subsequent American entry into World War I (which added immense US pressure to British efforts). [8]

  8. 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 ...

  9. Sussex pledge - Wikipedia

    en.wikipedia.org/wiki/Sussex_pledge

    In 1917, Germany became convinced that it could defeat the Allied Forces by instituting unrestricted submarine warfare before the United States could enter the war. The Sussex pledge was, therefore, rescinded in January 1917, which started the decisive stage of the so-called First Battle of the Atlantic .