The catastrophe of the First World War, and the destruction, revolution, and enduring hostilities it wrought, make the issue of its origins a perennial puzzle. Since World War II, Germany has been viewed as the primary culprit. Now, in a major reinterpretation of the conflict, Sean McMeekin rejects the standard notions of the war's beginning as either a Germano-Austrian preemptive strike or a "tragedy of miscalculation." Instead, he proposes that...