Battle of the Bulge
The Battle of the Bulge (16 December 1944 – 25 January 1945) 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 and became the costliest battle in terms of casualties for the United States, whose forces bore the brunt of the attack. It also severely depleted Germany's war-making resources.
The battle involved about 610,000 American men, of whom some 89,000 were casualties, including 19,000 killed. It was the largest and bloodiest battle fought by the United States in World War II.
The German losses in the battle were critical in several respects: the last of the German reserves were now gone, the Luftwaffe had been shattered and the remaining German forces in the West were being pushed back to the defenses of the Siegfried Line.