 The 256,300 man strong U.S. First Army, commanded by General Courtney Hodges, was ordered to break through the Siegfried Line around the area of Aachen, in order to reach the Rur river.Although the First Army began to encircle the area around Aachen in early September, the Battle of Aachen did not end until 21 October.The city cost the Americans roughly 3,000 casualties, but had opened the path to the Rur.