The effectiveness and typical brutality employed by the Orks onboard Terror Ships was best illustrated during the attack on the small Imperial resupply base on the planet Mirrobel, which was used by long-range patrols. Two Terror Ships, accompanied by a half-dozen Escorts, appeared in-system, took up orbit around Mirrobel's moon, and began launching repeated waves of Assault Boats filled with Greenskin warriors to overwhelm the station's small garrison. The Terror Ships then got a chance to demonstrate the power of their crude weapons when an Imperial Navy scout patrol consisting of the Dauntless-class Light Cruisers Abdiel and Uziel and a squadron of four Firestorm-class Frigates arrived in the system for resupply and counter-attacked the Ork warships after the Ork vessels attacked in the