This is a really impossible 'what if?' as the Germans were too weak, the Allies too strong ( particularly in air power ) for the Germans ever to have 'won' the battle.

But if the Germans had won - by deploying even more of their depleted strength to the Ardennes - then post-war European history would have been different because the Soviets would have snatched even more of Europe before the wars' end.....

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"Stand by to pull me out of the seat if I get hit" - Guy Gibson