There are 3 books in the Eagles of Rome series. The newest book is Eagles in the Storm which came out in 2017.

BASED ON REAL HISTORICAL EVENTS

A TIME FOR VENGEANCE
AD 9, German frontier: Close to the Rhine, a Roman centurion, Lucius Tullus, prepares to take his soldiers on patrol. On the opposite side of the river, German tribes are resentful of the harsh taxes about to be imposed upon them.…
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3
Eagles in the Storm

Book cover of Eagles in the Storm

AD 15. The German chieftain Arminius has been defeated, one of the lost Roman eagles recovered, and thousands of German tribesmen slain.

Yet these successes aren't nearly enough for senior centurion Lucius Tullus. Not until Arminius is dead, his old legion's eagle found and the enemy tribes completely vanquished will…