Gordon Dickson - Dorsai!

Throughout humanity's Fourteen Worlds, no group is as feared and respected as the Dorsai. The ultimate warriors, they are known for their deadly rages, and ferocious independence… and unbending honor. No one man rules the Dorsai, but their mastery of the arts of war has made them the most valuable mercenaries in the human universe.
“Dorsai!” is the saga of Donal Graeme, the uniquely talented Dorsai, with powers beyond those of ordinary men. Once he ventures to the stars, the world of the Dorsai will be changed forever.
The novel was originally published in serialized form in
, starting in May, 1959. A shorter, revised version was published in paperback by Ace in 1960 under the title
. A re-edited and expanded version of the novel was published under its original serialized title,
, by DAW in 1976. This version of the novel was reissued as one half of an omnibus edition,
by Tor in 2002, The other novel contained in
is
(originally published 1979).
Nominated for Hugo Award for Best Novel in 1960.