What was the Schlieffen Plan and how did Germany use it in 1914?

The Schlieffen Plan was a strategic military blueprint developed by Alfred, Graf von Schlieffen, chief of the German general staff from 1891 to 1905, to address the threat of a two-front war against France and Russia.123

The Strategy

Schlieffen recognized that Russia would require significant time to mobilize its vast armies. He proposed a "strategy of annihilation" (Vernichtungsstrategie), where Germany would maintain a defensive posture in the east while concentrating nearly seven-eighths of its forces in the west. The plan called for a massive, rapid "wheeling" movement through neutral Belgium and northern France to bypass French frontier fortifications, encircle the French army, and capture Paris within six weeks, effectively knocking France out of the war before turning to face Russia.23

Implementation in 1914

The plan was never implemented in its original form. Schlieffen’s successor, Helmuth von Moltke, significantly altered it by reducing the strength of the attacking right wing. During the 1914 invasion, Moltke further weakened the offensive by diverting troops to the east and to guard Belgian fortresses. Additionally, field commanders deviated from the plan, leading to a premature inward wheel of the German 1st Army that exposed its flank to a counterattack, ultimately contributing to the failure of the German offensive at the First Battle of the Marne.134