Union Forever: The Lost Regiment, Book 2 (Unabridged‪)‬

Colonel Andrew Keane and his blue-coated soldiers were not the first humans time-space-warped to a world so familiar yet so foreign. Humans abounded on the perverse planet-humans treated like cattle by the alien warrior overlords. Keane's Civil War weaponry defeated the swords, spears and crossbows of his monstrous adversaries. And part of the human population was freed, but the other part became puppets of the overlords in a vast counterattack. Now it was human vs. human, gun vs. gun, ironclad against ironclad, as the empires of Roum and Cartha clashed in gut-wrenching, soul-stirring struggle for the future of a world beyond time.