Roman army

The Roman Army was the army of the Roman Empire.

According to the Doctor, the Romans were the greatest military machine in the history of the universe, beating even the Daleks. (TV: The Pandorica Opens)

The Ninth Legion was a legion of the Roman Army which disappeared under mysterious circumstances in 2nd century Aberdeen. (TV: The Eaters of Light)

Arminius fought the Roman army in the European region which became Westphalia in Germany. Many people died in the battle. (PROSE: The Shadow in the Glass) The Romans and the Germanic tribes had a long history of confrontation. (PROSE: Warlords of Utopia)

Parallel universes
In the Known Worlds of Roma, the Roman Empire never fell. When Marcus Americanius Scriptor helped join the worlds together and formed the Empire of Empires, the Roman army became a multiversal force. The combined armies fought a great crusade against the Greater German Reich across the worlds of Germania, in which the Nazis won World War II. (PROSE: Warlords of Utopia)