The Last Charge — Jason M. Hardy

THE EPIC ACTION SAGA CONTINUES Anson Marik is at his wit's end. The Lyrans are pressing on his borders. His chief tactician has resigned. And his abilities as a leader are failing him. Now his enemies are on the move, taking the Commonwealth planet by planet, forcing Marik to pull his forces back in a bravely-fought running retreat. And if Marik cannot gather his strength to stop the invasion, his people will be doomed...