Portal:Military of the United States/Selected article/1
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Following the outbreak of the First World War in 1914, the German army opened the Western Front by first invading Luxembourg and Belgium, then gaining military control of important industrial regions in France. The tide of the advance was dramatically turned with the Battle of the Marne. Both sides then dug in along a meandering line of fortified trenches, stretching from the North Sea to the Swiss frontier with France. This line remained essentially unchanged for most of the war.
Between 1915 and 1917 there were several major offensives along this front. The attacks employed massive artillery bombardments and massed infantry advances. However, a combination of entrenchments, machine gun nests, barbed wire, and artillery repeatedly inflicted severe casualties on the attackers and counter attacking defenders. As a result, no significant advances were made. In an effort to break the deadlock, this front saw the introduction of new military technology, including poison gas and tanks. But it was only after the adoption of improved tactics that some degree of mobility was restored.
