On the 20th December 1944 with Western Europe in the grip of the worst winter for a generation, the Germans launch a blistering mechanised attack on the barely defended Allied frontline in the Ardennes. Their orders are to break through and re-capture the Port of Antwerp. The men of the US 101st Airborne are rushed to dig-in around the town of Bastogne and for the next week they halt the Nazi advance long enough for Patton’s 3rd Army to arrive and lift the siege.