Free Sword and Planet Download - Vengeance on Mars From September 1951 issue of Planet Stories magazine.

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This is a great sword and planet piece from the heady days of 'Planet Stories'. We get a short and sweet little tale of nastiness that can be turned into a solid little adventure encounter. We've got a bit of exploration, some betray, and high Martian drama. The  Lhrai are an interesting group of Martians with some heavy military overtones and a good handle upon their retro future technology.  They're a solid group of Martians with access to some nasty technology.  I've given them a work out in my Post Apocalyptic Mars game a few times. They make a nice mid range group of NPC's to throw at a party. In my games they've had fortunes that have gone up and down, gaining and losing city states over the centuries.
 This story makes a great cross over adventure from a space opera campaign straight into a sword and planet based one.  

The Basic 'Vengeance On Mars ' Set Up

Science Fiction short story published in September 1951 issue of Planet Stories magazine.

Blurb: "In the dim Water Temple, where the dead grinned down on the dead, Hale met his D-day. Should he give an ex-comrade to the torturing Lhrai or chance the massacre of Terrestrial thousands?"

A short Sci-Fi story penned by Jerome Bixby under the pseudonym D. B. Lewis. You've probably seen Jerome Bixby's work and not even known it. 
According to wiki :
 He is most famous for the 1953 story "It's a Good Life" which was the basis for a 1961 episode of The Twilight Zone and which was included in Twilight Zone: The Movie (1983). He also wrote four episodes for the Star Trek series: "Mirror, Mirror", "Day of the Dove", "Requiem for Methuselah", and "By Any Other Name". With Otto Klement, he co-wrote the story upon which the classic sci-fi movie Fantastic Voyage (1966), television series, and novel by Isaac Asimov were based. Bixby's final work was the screenplay for the 2007 cult sci-fi film The Man From Earth.

Sadly, we lost Mr. Bixby back in 2009 he was a science fiction powerhouse whose work seemed more behind the camera as a writer then as a best selling writer. From further research he was pretty prolific and solid in movies and television.