So much has been written about the Roman army in Britain that the vital role of the navy - both in support of the army and in the defence of this distant Roman province - has been largely overlooked. In providing the first comprehensive account of the Roman navy's importance in the conquest and defence of Britain, David Mason has redressed the balance. Combining archaeological evidence from recently excavated ships and harbour works with information from ancient sources, the author demonstrates the fleet's vital importance to the success of the Roman military conquest. He also provides new insights into the logistics and tactics of the Roman naval forces and their close cooperation with the Roman army.