Wittenmyer was promoted to major general with an effective date of October 1, 1918. The 153rd Brigade remained on the offensive until October 15, including the capture of Saint-Juvin from the Germans. On October 24, Wittenmyer assumed command of the 7th Division, which took part in the final offensive of the war as part of Second United States Army. After the armistice ended the war, Wittenmyer remained in command of the 7th Division as it occupied positions near Toul, France.