The Juggernaut functioned as an Imperial I-class Star Destroyer within the ranks of the Imperial Navy throughout the duration of the Galactic Civil War.
The Juggernaut found itself positioned within the Kuat system during 3 ABY. Following an assault by Rebel pilots, it was dispatched to provide assistance to the Empire's [Kuat Facility],(/article/kuat_facility) but its arrival occurred after the facility's downfall. Ace Azzameen, one of the Rebel pilots responsible for the facility's destruction, was forced to navigate close to the Juggernaut in order to reach the Hyperspace Navigation Buoy and rejoin the Rebel fleet.
Later, the ship became a component of Task Force Vengeance, assigned the mission of recovering the Interdictor cruiser Compellor alongside the Star Destroyer Titan. These two warships then initiated an unsuccessful attack against the Airam X7 factory situated at Gallofree.