What was the name of Germany's plan for a two-front war against France and Russia?

Germany’s plan for a two-front war against France and Russia was the Schlieffen Plan.

Developed chiefly by German chief of staff Alfred von Schlieffen between 1905 and 1906, the plan aimed to defeat France quickly in the west before Russia could fully mobilize in the east. German forces were expected to sweep through neutral Belgium and Luxembourg, envelop the French army, and capture Paris or force France out of the war within roughly six weeks.

Helmuth von Moltke the Younger modified and executed the plan in 1914. The German advance was slowed by Belgian resistance, logistical problems, stronger-than-expected Allied opposition, and Russia’s early mobilization. German troops were stopped at the First Battle of the Marne in September 1914.

A common mix-up is calling it the “Moltke Plan.” Moltke revised the strategy, but the name Schlieffen Plan refers to the broader German planning tradition associated with Schlieffen. Historians debate how closely the 1914 campaign matched Schlieffen’s original memorandum, but the stored answer is the standard quiz answer.