Book excerpt: 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.