Collected in this volume are all the known works and military memoirs of General Henry Lloyd, an eighteenth-century 'philosophe', who crafted a modern critical approach to military thinking. These six works serve as an introduction to and reflection on the theory of war produced during the Age of the Enlightenment. Republished from the originals, this is the first compilation and only modern edition of his political, economic and historical treatises. With introductory essays and annotations by the Editor, this volume provides both depth and context to the study of this long-neglected and misunderstood figure.