On Mars, which its natives call Barsoom, Carter achieves a military victory and wins the hand of a Martian princess, Dejah Thoris of Helium, but after several years of marriage he sacrifices himself to save Barsoom from the loss of its atmosphere.
Carter achieves a military victory. This is on Mars. Carter wins the hand of a Martian princess. This is on Mars. Dejah Thoris of Helium is a Martian princess. Its natives call Barsoom Mars. He sacrifices himself to save Barsoom from the loss of its atmosphere. This is after several years of marriage. This is on Mars.