The Tungrian auxiliary cohorts return to Hadrian's Wall after their successful Dacian campaign, only to find Britannia in chaos. The legions are overstretched, struggling to man the forts of the northern frontier in the face of increasing barbarian resistance. The Tungrians are the only soldiers who can be sent into the northern wastes, far beyond the long-abandoned wall built by Antoninus, where a lost symbol of imperial power of the Sixth Victorious Legion is reputed to await them.

Fresh from their victory in Germania, Marcus Aquila and the Tungrians have been sent to Dacia, on the northeastern edge of the Roman Empire, with the mission to safeguard a major source of imperial power. The mines of Alburnus Major contain enough gold to pave the road to Rome. They would make a mighty prize for the marauding Sarmatae tribesmen who threaten the province, and the outnumbered auxiliaries are entrusted with their safety in the face of a barbarian invasion.

The eighth book in the Empire sequence takes Centurion Marcus Aquila and his Tungrian legion on a dangerous mission to the heart of the Parthian empire. With Rome no longer safe, Marcus and the Tungrians are ordered east, to the desolate borderlands where Rome and Parthia have vied for supremacy for centuries. Ordered to relieve the siege of an isolated fortress, their task is doomed to bloody failure unless they can turn the disaffected Third Legion into a fighting force capable of resisting the terrifying Parthian cataphracts.

Britannia has been subdued - and an epic new chapter in Marcus Valerius Aquila's life begins. The murderous Roman agents who nearly captured Marcus have been defeated by his friends. But in order to protect those very friends from the wrath of the emperor, he must leave the province that has been giving him shelter. As Marcus Tribulus Corvus, centurion of the second Tungrian auxiliary cohort, he leads his men from Hadrian's Wall to the Tungrians' original home in Germania Inferior.

In the enthralling third volume of Empire, Anthony Riches takes the legions deep into north Britannia, where the survivors of the rebellion still hope for revenge.The Romans have vanquished the rebel alliance, leaving Calgus, Lord of the Northern Tribes, the prisoner of the chieftains he once led.But the new Roman leader will not let them rest. He forms an audacious plan to capture Dinpaladyr, the Selgovaes' fortress of spears, and return it to the hands of a trusted ally.