Deathworld 3 (1968)

The third installment in the Deathworld Trilogy, our hero takes his Light-o'-Love and all of the genetically-predisposed "survival experts" to conquer a new planet. The population of the Deathworld is now at loose ends and moribund, since the pacification of their deadly home world. The plot is based on the historical tale, (updated and fictionalized of course,) of the downfall of the Mongols and the Balkanization of their enormous empire after Temuchin's death, as (re-)told by the incomparable, inestimable Harry Harrison.