Janissaries Clan and Crown

Blurb

Janissaries is a novel by science fiction author Jerry Pournelle. It was originally published in 1979, and was illustrated by comic artist Bermejo. It is the first book of Pournelle's Janissaries series. The following books are Janissaries: Clan and Crown and Janissaries III: Storms of Victory.
Like King David's Spaceship, a novel in Pournelle's CoDominium Series, it is the story of a capable military leader undertaking campaigns on a backward planet.