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  2. Depth charge - Wikipedia

    en.wikipedia.org/wiki/Depth_charge

    Germany became aware of the depth charge following unsuccessful attacks on U-67 on 15 April 1916, and U-69 on 20 April 1916. [3] The only other submarines sunk by depth charge during 1916 were UC-19 and UB-29. [3] Numbers of depth charges carried per ship increased to four in June 1917, to six in August, and 30–50 by 1918. [4]

  3. German Naval Grid System - Wikipedia

    en.wikipedia.org/wiki/German_Naval_Grid_System

    German Naval Grid Reference (German:Gradnetzmeldeverfahren), was a system for referencing a location on a map. Introduced initially by the German Luftwaffe just before World War II , it was used widely in the German armed forces until 1943.

  4. Cruiser submarine - Wikipedia

    en.wikipedia.org/wiki/Cruiser_submarine

    The cruiser submarine concept originated during the unrestricted submarine warfare campaign of 1917.Three German Type U 139 submarines and seven former merchant submarines, each armed with two 15-centimetre (5.9 in) guns, patrolled areas distant from their North Sea bases to sink Allied merchant shipping as part of an effort to end World War I by starving the United Kingdom of Great Britain ...

  5. German First World War submarine was deliberately sunk, 3D ...

    www.aol.com/german-first-world-war-submarine...

    A German U-boat from the First World War is likely to have been sunk deliberately rather than being handed to the Allies, according to a 3D map produced by researchers.

  6. Western Front tactics, 1917 - Wikipedia

    en.wikipedia.org/wiki/Western_Front_tactics,_1917

    The changes in British tactics meant that they had swiftly established a defence in depth on reverse slopes, protected by standing barrages, in dry, clear, weather with specialist counter-attack reconnaissance aircraft for the observation of German troop movements and improved contact-patrol and ground-attack operations by the RFC.

  7. List of naval ship classes of Germany - Wikipedia

    en.wikipedia.org/wiki/List_of_naval_ship_classes...

    Armament: 2 x 10.5 cm guns; 4 x 3.7 cm AA gun; 10 x 2 cm AA guns; 4 x depth charge launchers; Performance: Speed 17 knots (31 km/h); Range 4,000 nautical miles (7,000 km) at 10 knots (19 km/h) Ships in class: 131; Service: Commissioned 1941 to 1944, 63 lost during World War II, five served with German Federal Navy

  8. Anti-submarine weapon - Wikipedia

    en.wikipedia.org/wiki/Anti-submarine_weapon

    Perhaps the simplest of the anti-submarine weapons, the depth charge, is a large canister filled with explosives and set to explode at a predetermined depth. The concussive effects of the explosion could damage a submarine from a distance, though a depth charge explosion had to be very close to break the submarine's hull.

  9. SM U-68 - Wikipedia

    en.wikipedia.org/wiki/SM_U-68

    SM U-68 was a Type U 66 submarine or U-boat for the German Imperial Navy (German: Kaiserliche Marine) during the First World War.She had been laid down in December 1913 as U-9 of the U-7 class for the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine or K.u. K. Kriegsmarine) but was sold to Germany, along with the others in her class, in November 1914.