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Opposing armies on the Western Front had dug miles of parallel trenches to protect themselves from enemy fire. Armies traded huge losses of human life for small land gains.
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Introduced by the Germans in 1914 as an effective warship. Its primary weapon against ships was a torpedo, an underwater missile.
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A new weapon introduced by the Germans but used by both sides. This could cause blindness or severe blisters, or even death because of choking.
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Armored combat vehicles that moved on chain tracks - and thus could cross many types of terrain. Introduced by the British in 1916.
