It has been over a decade since Andrew Keane's Union regiment was mysteriously pulled away from the Civil War and marooned in time on a hostile alien planet. But now it appears as if everything the Lost Regiment has fought and died for has been in vain.

The unrelenting war against the hordes has taken its toll on the fatigued humans, and the Bantag horde's latest siege has broken the Republic's will to fight. Keane resigns his position in the Republic's government when a peace parley is declared. Gathering the remaining veterans of the 35th Maine to his side, he plans a campaign that will take the Lost Regiment into the heart of the Bantag Empire to annihilate their ability to wage war once and for all. The outcome of this suicide mission will decide the fate of the human race on a world far from Earth.