The Outlaws of Mars [Kline, Otis Adelbert]

Jerry Morgan, fed up with Earthly frustrations, found plenty to occupy him when he swapped bodies with a hot-headed Martian from that red planet's era of glory. For Jerry's first moment there involved him in a costly mistake which was to throw him into conflict not only with the forces of evil and Mars' many monsters but also against the trained weapons of a haughty empire!