The Seventh Battleship Division is a unit within the Lost Fleet. At the time of the flight from the Syndic home system, the Seventh Battleship Division was even more understrength than the other divisions, and consisted of the battleships Indefatigable, Audacious, and Defiant, and was commanded by Captain Mosko of the Defiant.
The Seventh Battleship Division is eventually destroyed during the battle of Lakota where the three ships protect the fleet from being attacked by a larger Syndic flotila. The Seventh Battleship Division is remade at Varendal with the same amount of ships it had prior, being made up by the battleships Encroach, Sustain and Resound