Humanity Prime

When Man's emerging star-empire met that of the savage Cromanths, the alien hordes began a war of extinction against humankind. So overwhelming was their power that Earth's outposts and finally the Earth itself were utterly destroyed. But one starship managed to escape, carrying colonists for some distant Earthlike planet... if such a place existed... and if the Cromanths didn't find the human colony. The mission was successful and the colony established. Mankind began to adapt to its new world, developed new abilities, and forgot much of the past. But then a Cromanth ship landed on the new planet- the last remnants of humanity were discovered. Could they somehow survive a new onslaught by the Cromanth Empire? (adapted from the back cover of the first edition)