The secret weapon of the Third Reich
The Nazi army was definitely one of the most powerful in history. Numerous factors contributed to make it so: tactical military superiority, technology, a strong campaign of indoctrination and… a good dose of drugs, as amphetamine and methamphetamine. This was revealed is a book: "Toxic. The secret weapon of the Reich. The drug in Nazi Germany” written by a German journalist, Norman Ohler, which thoroughly explains the role of drugs in the triumphs of the German army during World War II.
Source: Defense Online