The USN Harbinger was an Endeavor-class "Super"-Cruiser that served with the United States Navy and participated in all major battles in the beginning of the First War of Continuation, including the First Battle of Mars (June 21 2401), the First Battle of Earth (July 2 2401), the First and Second Battles of Ganymede (August 5 2401 & August 30 2401) and the First and Second Battles of PX-67/Vespene (September 19 2401 & October 24 2401). She was captained by High Captain Michael Dawson, a senior naval captain who served on the Court of Appeals. She harbored the 1st Marine Battalion, which fought during the Battles of Ganymede and PX-67 or Vespene. Both were among the few survivors of the nuclear detonation on Vespene on September 19, 2401.
Harbinger was laid down on August 15, 2397, launched on December 6, 2397, and underwent a two-month trial period until finally being commissioned on February 24, 2398. She fought in two minor skirmishes against Rebel ships in 2399 and 2400, until the Captain at that time was relieved. Michael Dawson received command of the Harbinger on April 13, 2400. She gained recognition for the pyyrhic victory at Mars on June 21 and it's destruction of the enemy flagship, as well as the destruction of two enemy carrier-sized starships above Earth on July 2 with a significantly limited armament (after severe damages to the superstructure and weapons after the Mars confrontation).