The Sixth Legion of Terror are one of the fifteen Legions.
The Sixth Legion is lead by General Istrid, a fearsome orc veteran. Her legion is usually paired with the Ninth Legion under General Sacker because Sacker's patience is seen as a good balance against Istrid's impatience.
The Sixth has the nickname of Ironsides, in reference to a battle where they managed to break a Callowan cavalry charge, a feat which had thus far been considered more or less impossible. The victory was made even more impressive by the fact the Sixth contains a lot of orcs, and before the Reforms orcs had not been allowed to join the Legions and were treated as expendable grunts who often weren't even given armor.