The Martians were giants with the strength of twenty men. When they attacked Earth, it looked like all was lost. The Martians were just too strong. Fortunately, their immune systems were not strong enough to fight off common earthly bacteria. Edison’s Conquest of Mars is a science fiction story written in 1898 by Garret Putman Serviss. The story starts as the war for Earth ends, and humans chase the aliens back to their home on Mars.