The Battle of the Marne, fought from September 6 to September 12, 1914, was a pivotal conflict during World War I in which Allied forces halted the German advance into France. This battle marked a significant turning point in the war as it thwarted the Schlieffen Plan, which aimed for a quick German victory by invading France through Belgium. The successful counter-offensive by the Allies not only saved Paris but also established a lengthy stalemate on the Western Front, influencing military strategies for years to come.