Wahl commanded division's artillery during the rest of combats in the Northern France and participated in the Seine River Crossing at Mantes-Gassicourt, the first allied bridgehead across the Seine River in the aftermath of Operation Overlord, which allowed the Allies to engage in the Liberation of Paris. During the combats on the Siegfried Line in late 1944 and early 1945, Wahl assumed duty as Assistant Division Commander, 79th Infantry Division by the end of January 1945 and led Task Force Wahl, which consisted of the Third Battalion, of the 313th Infantry Regiment, the 315th Regiment, the 222nd Regiment, Combat Command A of the 14th Armored Division and the 827th Tank Destroyer Battalion.