During the stygian wars, the watch knights chapter made extensive use of firestorm aggressors in urban combat theatres. These units excelled at close quarters battle using flame gauntlets to burn out stygian infantry. The powered gauntlets also allowed aggressors to physically punch through even the heaviest armor. Thus even vehicles were threatened by aggressors in the tight confines of urban combat. The watch knights chapter also made extensive use of this aggressor variant in boarding actions. The suits being ideal for use in the close confines of a starship.