In addition to describing military operations, Rossino also provides close analysis of SS plans to murder Polish leaders, German army reprisal policies, and the close collaboration of Wehrmacht and SS forces in the subjugation and execution of Polish citizens. Rossino considers both top-level decision making and the experiences of German soldiers as he explores the mentality of those who perpetrated crimes against civilians. He particularly investigates the links between Nazi racial-political policies and military action to show that Poland was merely the German army's dress rehearsal for the later slaughter of other Slavs and Jews during the Russian campaign. By providing a detailed examination of atrocities committed by both military and SS personnel, he shows that the Wehrmacht's criminality was clearly evident at the beginning of the war. The book is a reconstruction of history that reveals the extent to which Nazi philosophy drove the German war machine.