The Allies first responded to the German attack on December 16, 1944, with Reinforcement of the front lines.

When the surprise offensive began in the Ardennes region, Allied commanders quickly recognized the urgency of stabilizing their positions. Troops were dispatched to bolster defenses and prevent further German advances. This strategic reinforcement was crucial, as it aimed to maintain control of key areas and minimize the impact of the offensive. While there were also efforts to organize a counterattack and calls for air support, the immediate focus was on shoring up the front lines. This decisive response allowed the Allies to regroup and ultimately mount a successful counteroffensive, playing a vital role in their victory in the Battle of the Bulge.