For the Eternal Glory of Rome

An Alternate Rome from a former Colonel in the United States Army and a Master of Alternate History
GIVE ME BACK MY LEGIONS!
In September of the year 9 A.D. three Roman legions are trapped in the Teutoburg Forest by tens of thousands of rebelling Germanic tribesmen under the Romano-German renegade, Arminius. In an attempt to save what can be saved, an alien starship transports one of those legions, Legio XIIX, to safety. But the aliens are rushed by events and transport the XIIXth not just in space, but through time as well.
Dropped four centuries into their future, under the leadership of their first spear centurion, Marcus Caelius and the young but promising junior tribune, Gaius Pompeius, Legio XIIX must fight to survive almost from the first moments of arrival. Moreover, they must march and fight across a continent to find their way home.
Because home, the Roman Empire, needs them—their discipline, their tactics, their indomitable fortitude—more desperately than it has ever needed anything . . . because New Years Eve, 406 A.D. is coming, and with it, a horde of barbarians are going to cross the frozen Rhine and, unless stopped cold, destroy the Empire.