The Genetics War was a war of indeterminite length that took place on the planet Mars some 250 million years before the present. It concerned three all-female species: the two dominant species, and a sterile hybrid race that were bred by the other two specifically to be slaves, soldiers, and prostitutes. The third race rose up against the two parent races and eventually destroyed them-- and much of the life on the planet-- with an "iron oxide bomb" that reduced Mars to the ball of rust we know today.