The SLS Hancock was a Star League WarShip which acted in support of the SLDF III Corps when an raiding force and followup invasion force from the Taurian Concordat attacked Diefenbaker in late 2584 or early 2585. Diefenbaker was a Taurian world which had been occupied by the SLDF and used as the headquarters for III Corps; the initial raiding force landed as most of III Corps were already aboard DropShips in transit to their JumpShips, following orders to attack Lindsay. As the raiding force prosecuted a spoiling campaign against III Corps, a full invasion force was prepared and arrived in system n the 4th of February 2585, beginning an extended campaign to try and capture the world. The SLS Hancock was one of at least three SLD WarShips involved in the resulting action, and was responsible for destroying the bulk of the Calderon Red Hand regiment via orbital bombardment while trying to assist Major General Natasha Azzi and two mixed regiments of SLDF troops during the four hour long Battle of Lost Valley.
- Historical: Reunification War, p. 84, "Calderon's Response"