Erinnic functioned as an Imperial II-class Star Destroyer within the Imperial Starfleet. Vice Admiral Ark Poinard was its commanding officer, a role he held since the era of the Empire, at which time the vessel was equipped solely with TIE Fighters. In spite of the Empire's anti-Jedi stance, Poinard was known for his distinctive farewell: "May the Force be with you!". Notably, the ship's command structure included a female officer.
During the events of the Battle of Ord Mantell, the Erinnic spearheaded the fleet under the command of General Yald Sutel. This fleet was deployed based on intelligence from Elan, indicating that the Yuuzhan Vong were planning an attack on Ord Mantell. The fleet initiated its attack by ambushing the Yuuzhan Vong from behind the fifth planet, while the Erinnic was positioned between Ord Mantell's moons. The rest of the fleet waited for the Erinnic to emerge, with the goal of driving the Yuuzhan Vong command ship toward the Jubilee Wheel and subsequently out of the system.