sentences:  On 13 December V Corps, already at the Rur, was tasked to start an offensive to seize the dams from various directions including the Ardennes sector.The offensive took the Germans by surprise, but as the Allies ran directly into the Germans being near ready for the Ardennes Offensive, resistance soon stiffened.On 16 December the Germans launched their final all-out offensive on their western front, "Wacht am Rhein", which led to an immediate end of all Allied offensive efforts in this sector.