When the Second World War broke out, Nazi Germany was determined to present its struggle as a purely Aryan crusade. Yet as the conflict expanded and the human cost mounted, Hitler’s armies increasingly relied on non-Aryans to sustain the fight. By the war’s end, hundreds of thousands of foreigners had donned the uniform of the German Feldheer (Field Army). These men filled the ranks of the Wehrmacht and the Waffen-SS. Their stories – stretching from Scandinavia to the Balkans, from France and Spain and North Africa to the Baltic States and the Soviet Union – reveal the extent to which the Third Reich was a multinational war machine, despite its own racist ideology. Hitler’s Foreign Fighters is a comprehensive study of these men, exploring who they were, the various reasons they ended up serving in the Wehrmacht or Waffen-SS, and how they were used by a regime that both despised and depended upon them. Some were convinced volunteers, persuaded by propaganda and anti-Communist zeal. Others were opportunists seeking better pay, self preservation, or better rations. Many more were conscripts or reluctant recruits, swept up by coercion, circumstance, or fear. Together, they formed one of the most diverse and complex groups of participants in the war, a group that challenges simple categories of collaboration and resistance. The book traces the full arc of this phenomenon, from the early enlistment of ‘Aryan’ Germanic volunteers celebrated as racial brothers, to the gradual widening of recruitment into Western Europe, the Balkans, North Africa and the occupied Soviet territories. As the tide of war turned, the Nazi regime grew ever more desperate, drawing upon ethnic Germans from annexed regions, Slavic conscripts, and even Muslim contingents from the Caucasus and North Africa. Authoritative and wide-ranging, this book sheds new light on one of the most revealing yet understudied dimensions of the Second World War. By uncovering the multinational character of Hitler’s armies, it challenges assumptions about the war in Europe and deepens our understanding of how ideology, pragmatism, and desperation intersected in the making of the Nazi war effort.