Legacy

From the back cover of the Baen first edition: "Only King Arthur and save us now! Humanity is Not Alone: we share this galaxy with a species as cruel and rapacious as the mind of man can well conceive, a species with nothing but conquest on its hive mind. With the aid of Raehaniv, the humans from Earth - through the services of the U.S. Space Force - have managed to beat off the hideous threat. Peace at last? Nope. Life is not that simple: not only is This universe accessible through the ultralight drive that saved the day in The Disinherited. other ages are accessible through the technology of the far remote future. Result? U.S. Space Force meets King Arthur in a battle to save the Universe in Legacy"