A Princess of Mars : John Carter of Mars: book one
(Book)

When Civil War veteran Captain John Carter is incredibly transported from Earth to a strange landscape on Mars, he finds that the weak gravity exponentially increases his speed and strength. Taken prisoner by Martian warriors, Carter impresses them with his remarkable fighting skills, and is quickly made a high-ranking chieftain. Before long, the captain finds himself embroiled in the deadly warfare and dark intrigues that have been polarizing the Martian races. The heroic Carter also finds dangerous romance with the divine princess Dejah Thoris, who wins Carter's love the first moment his eyes meet hers.