After this, a task force of the Fire Lords Chapter, under the command of Captain Jaric Phoros, was despatched to bring order to the war-torn planet. The Space Marines found the rebels of Grissen firmly entrenched within their sprawling cities and fortifications, and despite Imperial Navy bombardments on a near-apocalyptic scale, the rebels had been able to hold out, even as their cities burned and their bastions fell about them. In fact, Munitorum Strategio-savants eventually realised that the more the Imperial Navy vessels pummelled Grissen from orbit, the more cover the rebels were afforded by the twisted and anarchic ruins, and that only the deployment of the elite Space Marines could root the enemy from their positions.