einem's right wing units would also participate in 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 john j. pershing's allied expeditionary force from 26 september – 11 november in the meuse-argonne offensive, the army was forced to retreat northward shortly before the war's end. at the end of the war it was serving as part of "heeresgruppe deutscher kronprinz".