Composite image of soldiers being mustered out at Camp Dix, New Jersey, in 1918 and German soldiers laying dead at the Battle of the Marne, 1914. During World War I, Camp Dix was a training and staging ground for the 78th, 87th and 34th Divisions. Camp Dix grew quickly and became the largest military reservation in the Northeast. Following the armistice, the camp became a demobilization center. To "muster out" means to discharge or be discharged from military service. The Battle of the Marne was a WWI battle fought between September 5-12, 1914. The battle ended the month long German offensive that opened the war and had reached the outskirts of Paris. The counterattack of six French field armies and one British army along the Marne River forced the German Imperial Army to abandon its push on Paris and retreat northeast, setting the stage for four years of trench warfare on the Western Front. The battle of the Marne was an immense strategic victory for the Allies, wrecking Germany's bid for a swift victory over France and forcing it into a drawn-out two-front war.