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The Battle of the Bulge was the last major German offensive campaign during World War II. Launched through the densely forested Ardennes region of Wallonia, it caught the Allies off guard and led to severe casualties. The name refers to the salient created by German advances in December 1944, shown on this map (higher resolution); the battle concluded with an Allied victory in January 1945.
Legend:
Front line, 16 December
Front line, 20 December
Front line, 25 December
Allied movements
German movements
Map: Grandiose and Matthew Edwards