The Aggressor functioned as a Victory-class Star Destroyer within the Imperial Navy throughout the period of the Galactic Civil War.
In one engagement of the conflict, the Aggressor's designated role was to eliminate the CR90 corvette group known as Athega should the main attacking squadron be unsuccessful. However, a Rebel cruiser intervened, deploying a large number of X-wings with the express purpose of obliterating the Star Destroyer.