This chapter examines the psychological and physiological challenges faced by soldiers during World War I and II, focusing on the use of methamphetamine as a performance enhancer. It contrasts the drug's impact on German troops with the reliance of French soldiers on red wine, highlighting the overlooked role of substances in warfare. The discussion also connects historical drug use to contemporary issues, such as the use of Captagon in modern conflicts, emphasizing the military implications and psychological effects of such substances.