The Roman war machine comprised land and naval forces. Although the former has been studied extensively, less has been written and understood about the naval forces of the Roman empire and, in particular, the regional navies which actively participated in most military operations and policed the seas and rivers of the Empire. Until the mid-third century, in a British context, this navy was the Classis Britannica--a strong fighting force in its own right. The composition, ship types, roles, tactics, and technology have never been studied at length. Here Elliot tells the story of this illustrious naval force in their metal-beaked galleys and their exploits defeating enemies of the Empire and keeping the peace around the British Isles.