The Schlieffen Plan was a strategic concept developed by Count Alfred von Schlieffen, Chief of the Imperial German General Staff from 1891 to 1906. Confronted with the Franco-Russian Alliance of 1894, German planners feared simultaneous war on western and eastern fronts. Schlieffen's answer, refined in a memorandum of 1905, was to exploit Russia's expected slow mobilization by concentrating overwhelming force in the west, sweeping through neutral Belgium and the Netherlands in a great wheeling movement, encircling Paris from the north, and crushing the French army within roughly six weeks. German forces would then redeploy east by rail to confront Russia.
When war came in August 1914, Schlieffen's successor Helmuth von Moltke the Younger executed a modified version. Moltke spared the Netherlands, reduced the strength of the right-wing sweep, and detached corps to East Prussia and Alsace-Lorraine. German armies invaded Belgium on 4 August 1914, triggering British entry into the war under the 1839 Treaty of London guaranteeing Belgian neutrality. The advance reached within roughly 50 kilometers of Paris before being halted at the First Battle of the Marne (5–12 September 1914), after which both sides dug in for four years of trench warfare.
Historians continue to debate whether a genuine, fully operational "plan" existed or whether the 1905 memorandum was an aspirational study. Terence Zuber's work since the late 1990s has argued the plan as traditionally described is partly a postwar reconstruction by defeated German officers seeking to blame Moltke. Regardless, the concept remains a standard case study in:
- the dangers of rigid mobilization timetables
- violations of neutrality as casus belli
- the gap between operational planning and political consequence
For MUN and IR students, the Schlieffen Plan illustrates how alliance structures, military doctrine, and railway logistics can convert a regional crisis—Austria-Hungary's quarrel with Serbia after the 28 June 1914 assassination of Archduke Franz Ferdinand—into a continental war.
Example
In August 1914, Germany invoked the logic of the Schlieffen Plan when it invaded neutral Belgium, prompting the United Kingdom to declare war on 4 August 1914.
Frequently asked questions
That is the traditional view, but historians like Terence Zuber argue the original plan was less concrete than postwar German officers claimed, making the 'weakening' narrative partly self-serving.
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