The Armageddon Steel Legions are the regiments of the Imperial Guard that fight as mechanised infantry alongside Chimera armoured personnel carriers in defence of the strategically-located Imperial Hive World Armageddon and its surrounding star systems. Armageddon, located in the Segmentum Solar, was a planet blighted and poisoned by millennia of heavy industrial output, though it was also a major manufacturing centre. In the 41st Millennium Armageddon became a constant battleground between the Imperial Guard's Steel Legion Regiments and the countless Ork hordes of the Warboss Ghazghkull Mag Uruk Thraka.