The humans reach Mars, but in spite of their superior forces they have lost half their men to the Martians' overwhelming numbers. The Martians envelop the planet in a smoke screen, and the humans retreat to the moon Deimos . During a raid on Mars for supplies, the earth men find Aina, the last of a population of human slaves whose ancestors were captured from Kashmir in a Martian raid 9,000 years before. During this raid, the Martians also constructed the Great Pyramids and the Great Sphynx in Egypt , the latter of which is a statue of their leader. Aina advises Edison that meeting the Martians in battle would be fruitless, and that they should instead attack the dams that channel water from the polar ice. Since most of Mars' cities are under sea level, the flood spreads rapidly, killing most of the Martians and destroying their civilization. Edison and company force a peace with the surviving Martians, and return home to great celebration.