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In page Battle of the Bulge:

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Although the Germans managed to begin their offensive with complete surprise and enjoyed some initial successes, they were not able to seize the initiative on the Western Front. While the German command did not reach its goals, the Ardennes operation inflicted heavy losses and set back the Allied invasion of Germany by several weeks. The High Command of the Allied forces had planned to resume the offensive by early January 1945, after the wet season rains and severe frosts, but those plans had to be postponed until 29 January 1945 in connection with the unexpected changes in the front.[citation needed][1]