Leigh Brackett 
Black Amazon of Mars [EPUB ebook] 

Through all the long cold hours of the Norland night the Martian had not moved nor spoken. At dusk of the day before Eric John Stark had brought him into the ruined tower and laid him down, wrapped in blankets, on the snow. He had built a fire of dead brush, and since then the two men had waited, alone in the vast wasteland that girdles the polar cap of Mars.