sentences:  Like the old style Swiss mercenaries who hired themselves out to the Italian states, Dorsai hire themselves out to other planets.A series by Mercedes Lackey concerning mercenaries is the "Vows and Honor" Trilogy ("The Oathbound", "Oathbreakers", "Oathblood").Barry Sadler formerly of the U.S. Army Special Forces and singer of "Ballad of the Green Beret" wrote a series called Casca series about Casca Rufio Longinius, a soldier in the Roman legions who is cursed by Christ on Golgotha for driving a spear into him.