The armed forces of Rome, particularly those of the later Republic and Principate, are rightly regarded as some of the finest military formations ever to engage in warfare. Less well known however is their use by the State as tools for such non-military activities in political, economic and social contexts. In this capacity they were central instruments for the Emperor to ensure the smooth running of the Empire. In this book the use of the military for such non-conflict related duties is considered in detail for the first time. The first, and best known, is running the great construction projects of the Empire in their capacity