The Battle of the Bulge (Ardennes Counteroffensive) (16 December 1944 – 25 January 1945) was the last major German offensive campaign on the Western Front during World War II. It was launched through the densely forested Ardennes region of Wallonia in eastern Belgium, northeast France, and Luxembourg, towards the end of the war in Europe. The offensive was intended to stop Allied use of the Belgian port of Antwerp and to split the Allied lines, allowing the Germans to encircle and destroy four Allied armies and force the Western Allies to negotiate a peace treaty in the Axis powers' favor.
The Germans achieved total surprise on the morning of 16 December 1944, due to a combination of Allied overconfidence, preoccupation with Allied offensive plans, and poor aerial reconnaissance. American forces bore the brunt of the attack and incurred their highest casualties of any operation during the war. The battle also severely depleted Germany's armored forces, and they were largely unable to replace them. German personnel and, later, Luftwaffe aircraft (in the concluding stages of the engagement) also sustained heavy losses. The Germans had attacked a weakly defended section of the Allied line, taking advantage of heavily overcast weather conditions that grounded the Allies' overwhelmingly superior air forces. Fierce resistance on the northern shoulder of the offensive, around Elsenborn Ridge, and in the south, around Bastogne, blocked German access to key roads to the northwest and west that they counted on for success. Columns of armor and infantry that were supposed to advance along parallel routes found themselves on the same roads. This, and terrain that favored the defenders, threw the German advance behind schedule and allowed the Allies to reinforce the thinly placed troops. The furthest west the offensive reached was the village of Foy-Nôtre-Dame, south east of Dinant, being stopped by the British 21st Army Group on 24 December 1944. Improved weather conditions permitted air attacks on German forces and supply lines, which sealed the failure of the offensive. In the wake of the defeat, many experienced German units were left severely depleted of men and equipment, as survivors retreated to the defenses of the Siegfried Line.
The Germans' initial attack involved 410,000 men; just over 1,400 tanks, tank destroyers, and assault guns; 2,600 artillery pieces; 1,600 anti-tank guns; and over 1,000 combat aircraft, as well as large numbers of other armoured fighting vehicles (AFVs). These were reinforced a couple of weeks later, bringing the offensive's total strength to around 450,000 troops, and 1,500 tanks and assault guns. Between 63,222 and 98,000 of these men were killed, missing, wounded in action, or captured. For the Americans, out of a peak of 610,000 troops, 89,000 became casualties out of which some 19,000 were killed. The "Bulge" was the largest and bloodiest single battle fought by the United States in World War II and the second deadliest battle in American history.