Liberating Fontainebleau on 23 August, the corps moved rapidly east against disorganized German resistance and seized bridgeheads over the Seine River at Melun and Montereau.

Still pushing east at a rapid rate of advance, XX Corps liberated Château-Thierry and captured a bridgehead across the Marne River on 27 August 1944.

While the corps was at a standstill for a lack of gasoline, the Germans in and south of the fortress city of Metz had been hurriedly reorganizing and establishing cohesive defensive lines.

Despite its less than impressive heritage, the 462nd Division would prove to be a determined foe for no less than three months, significantly delaying XX Corps' push to the German frontier.

On 7 September 1944, elements of XX Corps, again refueled but still facing persistent shortages of gasoline and artillery munitions, moved out towards Metz and Thionville.

On 12 September, the 90th Infantry Division cleared Thionville west of the Moselle River, and engineer bridges were completed at Arnaville, allowing armored fighting vehicles to cross into the bridgehead.

Subsequently, artillery fire from Fort Driant (part of the Metz fortifications) made bridging and ferrying operations by the corps at Arnaville quite difficult.

In March 1966, according to the Daily Kent Stater, it was under the command of Maj. Gen. Henry K. Benson Jr. XX Corps received the French order of the Legion of Honour from the prefect of the Department of the Upper Marne on 6 November 1944.