Brothers of Earth

Kurt Morgan's survival capsule brought him down safely on a nameless Earth-type world. He was the only one left of the battle crew that had just annihilated a human planet of the Hanan, the enemy in a galactic war. The planet was inhabited by humanoids with a pre-technology civilization, a complex religion, and a long history of intricate internal relations. There was one other galactic battle survivor on that world - and she was an officer of the hated Hanan - and also the high priestess of the land in which Kurt had found refuge. (from the back cover of the DAW 1st edition)