Crisis of Empire series by David Drake

Donal Graeme set out to re-shape the galaxy, but first he must tear it apart. Donal Graeme, Dorsai of the Dorsai, was the final link in a long genetic train, the ultimate soldier, whose breadth of vision made him a Read more

They were Roman soldiers— and they were still alive because there were no better killers in the galaxy. The Galactics need fighters who could win battles without the aid of technology. That's why, when Rome's legions suffered disaster at Carrhae, Read more