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In page Blitzkrieg:

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Subsequently, shortages soon developed in food, fuel and ammunition and severely hampered the German defenders. German vehicle crews and even flak units experienced great difficulty moving during daylight.[a] Indeed, the final German offensive operation in the west, Operation Wacht am Rhein, was planned to take place during poor weather to minimise interference by Allied aircraft. Under those conditions, it was difficult for German commanders to employ the "armored idea", if at all.[citation needed]