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 were met with strong resistance from the Allied forces, including troops from the United States and France. The Allies launched a counteroffensive that successfully pushed back the German troops, leading to heavy casualties for the Germans. This battle not only halted the German advance but also boosted the morale of the Allied forces, setting the stage for their eventual victory in the war.