As part of the Second Battle of the Marne, American forces under Gen. John Pershing teamed with the French to earn a key victory at Château-Thierry. The Allied forces executed a surprise early morning counterattack on the Germans, suffering major casualties but gaining important ground.
Allied forces under American Gen. John Pershing began the Saint-Mihiel offensive on September 12. The Allies successfully pushed the Germans out of the Saint-Mihiel salient in France, opening rail communications between Paris and portions of the eastern front and demoralizing German forces.
The Western Front was the contested frontier between the English Channel and Switzerland during World War I. The front was the line along which much of the war was fought between the Allies to the west and Germany to the east. The front was largely unmoved throughout the war, as the two sides engaged in a long deadlock of trench warfare.