Einem's right wing units would also participate in Gen. Erich Ludendorff's Champagne-Marne offensive on 15–17 July 1918 supporting the east flank of the German 1st Army. After suffering severe casualties in battle with Gen. John J. Pershing's Allied Expeditionary Force from 26 September to 11 November in the Meuse-Argonne offensive, he was forced to retreat northward shortly before the war's end. On 10 November 1918, only one day before the declaration of the Armistice, command of Prince Wilhelm's Army Group German Crown Prince fell to Einem who would oversee Germany's demobilization. Retiring from the army in 1919, Einem lived in retirement until his death in Mülheim on 7 April 1934.