From the reign of Augustus (27 BC–AD 14) onwards the Roman Army became a standing force with permanent fortresses distributed throughout the empire. These fortresses developed from the temporary fortifications of the legions on campaign into temporary wooden structures, before finally becoming more elaborate stone fortifications designed to stand the test of time. This book describes the development, design and construction of these fortresses throughout the length and breadth of the Empire. It also deals extensively with the experience of life within a typical fortress and covers the operational history of these fortifications throughout the whole of the imperial period.