"The Battle of the Bulge (16 December 1944 – 25 January 1945), also known as Unternehmen: Wacht am Rhein, was a major German offensive campaign launched through the densely forested Ardennes region of Wallonia in Belgium, France, and Luxembourg on the Western Front toward the end of World War II in Europe.
The surprise attack caught the Allied forces completely off guard. United States forces bore the brunt of the attack and incurred their highest casualties for any operation during the war. The battle also severely depleted Germany’s armored forces on the western front which Germany was largely unable to replace. German personnel and Luftwaffe aircraft also sustained heavy losses.
The Germans’ initial attack included 200,000 men, 340 tanks and 280 other tracked vehicles. Between 67,200 and 100,000 of their men were killed, missing or wounded. For the Americans, 610,000 men were involved in the battle, of whom 89,000 were casualties, including up to 19,000 killed. It was the largest and bloodiest battle fought by the United States in World War II."