By Right of Arms (Terra Rising)

The Confederated Nations of Terra receive a mysterious distress signal from Earth's closest celestial neighbor, Alpha Centauri. Captain Aaron Richardson and the crew of the TNS Intrepid are Shocked and horrified by what they find. What they discover launches them into a new universe of political and military intrigue. Using ancient legends, they forge Earth's position in the Principean Empire and discover the secrets of Earth's distant past. Thwarted at every turn by pirates, they must fight a race of aliens who are intent on killing all humans and destroying the Earth. Unable to do it alone, they must seek assistance of new allies to save their home.