sentences:  While Ninth Army's advance was successful, at the beginning of December VII Corps had just left the Hürtgen Forest, was still short of the Rur and had taken heavy casualties.For the upcoming conclusion of the offensive, 1st Infantry Division was replaced by 9th Infantry Division and 4th Infantry Division by the 83rd Infantry Division.After a deliberate break for reorganisation, the attack was resumed on 10 December towards the Rur and the key city of Düren.