After the French capitulation it spent until mid-1944 protecting the Atlantic coast of France from a possible seaborne incursion. Following the Normandy invasion in 1944, the army reorganized in Lorraine after a hasty retreat with the rest of the German forces across France in August 1944. During the battles along the German frontier, the First Army attempted to prevent the Third United States Army from crossing the Moselle River and capturing Metz while also attempting to hold the northern Vosges Mountains against the Seventh United States Army.