In September 1944, three months after the invasion of Normandy, the Allied armies prepared to push the German forces back into their homeland. Just south of the city of Aachen, elements of the U.S. First Army began an advance through the imposing Huertgen Forest. Instead of retreating, as the Allied command anticipated, the German troops prepared an elaborate defense of Huertgen, resulting in a struggle where tanks, infantry, and artillery dueled at close range.