It is part of Dickson's Childe Cycle series, in which mankind has reached the stars and divided into specialized splinter groups.
Most notable of these are: the Exotics, philosophers, mystics and psychologists; the Friendlies, puritan faith-holders who supplement the meager production of their rocky worlds by hiring out as mercenaries; and the Dorsai, professional soldiers.
Lieutenant Colonel Cletus Grahame has been an instructor at the Western Alliance military academy since a battle injury crippled one of his knees, and forced his retirement from active duty.
This description is an adaptation of a similar concept in the novel Scaramouche by Rafael Sabatini when the character Moreau studies at the salon of the Master of Arms.
Putting his theories to work, Grahame repeatedly entices deCastries and the Neulanders into attempting incursions, where he is ready to pounce on them.
Using the Dorsai troops, who had been underestimated and little-used by the Alliance command, he actually wins the war, handing deCastries a humiliating defeat.
With their advanced training and superior tactics, they can defeat larger forces and suffer far fewer casualties than any others, making them far more economical for other worlds to hire.
Algis Budrys gave the novel a mixed review, saying that although "there is no denying the power of this kind of storytelling, for all that logical analysis yields some stuff that can sound either ludicrous or gamy.