This survey of Roman imperial grand strategy reassesses the questions of the Emperors' knowledge of military policy, of how they applied what they knew, and of how effective their efforts were in protecting the military integrity of the Roman Empire within the framework of political, diplomatic, and economic constraints. Arther Ferrill also examines the role of personality (leadership or lack of it) and religion. A pertinent contribution to the recent revival in the study of miltary history. Co-published with the Association of Ancient Historians.