The Second Battle of the Marne took place from July 15 to August 5, 1918, during World War I. It marked a significant turning point in the war as the last major German offensive on the Western Front. The battle involved a large-scale attack by German forces aimed at capturing Paris, but they faced a strong counteroffensive from the Allies, including troops from the United States and France. The battle resulted in a decisive victory for the Allies, leading to the retreat of German forces. This defeat weakened the German military and boosted Allied morale, ultimately contributing to the end of the war in November 1918. The successful defense at the Marne demonstrated the effectiveness of coordinated Allied strategies and marked the beginning of a series of offensives that would push the Germans back.