The idea of driving the whole German army through the Ardennes, not the methamphetamine, is what won the campaign in the West.

That was the victorious idea. So it's not the drugs. Actually, that idea to go through the Ardennes Mountains, if you think monocausal, you would say that's the reason. That idea was genius, and Hitler immediately understood it, because before, the plan was to attack in the north of Belgium, which is the same as World War I.