ENS (formerly PNS and later GSNS) Wallenstein was a Warlord-class battlecruiser built and originally operated by the naval forces of the Office of State Security before its capture by the "Elysian Space Navy".
In October 1913 PD, the Wallenstein was one of the ships assigned to a reinforcement squadron commanded by the senior StateSec officer in the Shilo Sector, Major General Prestwick Thornegrave, which had been sent to the Seabring System, recently been recaptured by the People's Republic of Haven in the aftermath of Operation Icarus.
As with all other units of General Thornegrave's squadron, Wallenstein entered orbit of the planet Hades for a scheduled stop, without knowing that the planet had previously fallen to an uprising led by Admiral Honor Harrington. With the planetary defenses firmly under the rebels' control, Wallenstein was forced to surrender, but not before suffering damage after the battlecruiser PNS Attila was destroyed by Hades' defenses. Thus under the former inmates' control, Wallenstein was incorporated to the so-called "Elysian Space Navy", being placed under the command of Commodore Alistair McKeon. (HH8)
Wallenstein participated in the Battle of Cerberus which resulted in the destruction of General Seth Chernock's entire task force. After the battle, Wallenstein and the rest of the Elysian Space Navy embarked as many former inmates as she could and left the Cerberus System to join the Allied forces in Trevor's Star.