Roberts embarked for France in August 1918 and participated in the combat operations against German Army on the Western Front. Elements of the 81st Division first saw limited action by defending the St. Dié sector in September and early October. After relief of mission, the 81st Division was attached to the American First Army in preparation for the Meuse-Argonne Offensive. In the last days of World War I, the 81st Division attacked a portion of the German Army's defensive line on 9 November 1918, and remained engaged in combat operations until the Armistice with Germany on 11 November 1918.