Invader / Simon Turney.

"An Aries Book."

"58 AD, Rome. Agricola, teenage son of an impoverished yet distinguished noble family, has staked all his resources and reputation on a military career. His reward? A posting as tribune in the far-off northern province of Britannia. Serving under renowned general Suetonius Paulinus, Agricola soon learns the brutality of life on the very edges of the empire, for the Celtic tribes of Britannia are far from vanquished. To take control of the province, the Romans must defeat the ancient might of the druids - and the fury of the Iceni, warriors in their thousands led by a redoubtable queen named Boudicea..."--Publisher.