This volume explores the essence of German military professionalism as exemplified by the nineteenth century Prussian German Staff. The study focuses on the most important Prussian military reformer—Gerhard Johann David von Scharnhorst, who in 1801 founded the Militarische Gesellschaft (Military Society) in Berlin. The Gesellschaft became the focal point for the transformation of the Prussian army from a robotic war machine into a modern fighting force that was instrumental in defeating Napolean in 1813 and in 1815. The author examines the following elements of this military society: its membership; the specifics of its agenda; the intellect, imagination, and habits of thought, reflection, and objective analysis of its members; Scharnhorst's particular contributions.