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| Dover Barrage ： ウィキペディア英語版 |
Dover Barrage
The Dover Barrage was an underwater blockade of German submarines attempting to use the English channel during World War I. The barrier consisted of minefields laid between Belgium and Dover at the outbreak of war, followed in February 1915 by steel netting anchored to the sea bed.〔(【引用サイトリンク】title=The Dover Barrage )〕 The first stage of the barrage was completed in April 1915 and it was patrolled by ships of the Dover patrol. Both sides initially believed the barrier to be effective and the Germans attributed some losses to it. However in March 1916, the Germans found their submarines could traverse the Channel on the surface at night. The British moved the barrier to cover Folkstone-Cap Gris Nez and used new mines and searchlights effectively closing the Channel to hostile submarines in August 1918.〔 Underwater scanning of the area covered by the Dover Barrage shows the wreck of SM UB-109 broken in half.〔(【引用サイトリンク】title=The Maritime Archaeology of the Dover Barrage )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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