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[[File:Schlieffen Plan.jpg|thumb|The red dashes show the deployments proposed by Schlieffen in 1905.]]
The '''Schlieffen Plan''' was a plan for a German invasion of France that was drawn up in 1904 by Count Schlieffen, chief of the German General Staff. It evolved into the plan of attack used in [[World War I]] (1914-1918). Although the plan used in 1914 is quite different from any plan that Schlieffen himself was responsible for, it customary to refer to it as the Schlieffen Plan.
German forces would outflank the French fortresses in Lorraine by advancing through Belgium, according to the plan. In the original version, a large German force would swing around Paris and attack the French from the south. The most controversial feature of the plan was the proposed advance across Belgium, a nation whose neutrality was guaranteed by Britain and other countries.
In 1914, the Germans arrived at Marne, a river north of Paris, after an exhausting march across Belgium and northeastern France. After briefly fighting with French and British forces, they stopped to wait for supplies. As the armies rested, they dug trenches. Four years of trench warfare followed.
In 1904, a copy of the Schlieffen plan was provided to French intelligence by an agent called Le Vengeur, but the French failed to take advantage of it.