The Regiment's War

The B Team was easy; now try the A Team... For centuries the coal-black mercenaries of the planet Tyss had been legendary for their military prowess, and when they bestowed their secret T'swa training on a group of young people from the planet Iralya, a new legend was created. Now the White Regiment has won its first contract to defend one planetary nation from invasion by another on the same world. Until now the victories have come cheap - but what began as a cakewalk against a local army soon becomes something different; the wealthy aggressor has hired a regiment from Tyss. The Black Regiment is curious to see just how well the White Regiment has learned its lessons... (from the back cover of the Baen Books first edition)