Punishment of Hyaela

The Punishment of Hyaela was an Imperial castigation campaign carried out by the Forge Templars Space Marine Chapter, when they dispatched a company of their Astartes to the prison world of Hyaela that had erupted in planet-wide insurrection. The source of the uprising was a hidden Chaos Cult, which had remained hidden in the subterranean depths of the prison planet.

History
On the prison world of Hyaela inmates revolts are common. However, when the garrison was overrun by the most violent rising since the colony establishment, the Chief Provost quickly asked for the help of the Forge Templars. When the 3rd company arrived, they quickly secured the main guard tower and proceeded to rally the surviving provost forces. However it was through the valiant sacrifice of Squad Ladon that the chilling truth behind the revolt was unveiled.

In the deepest mine shaft of the planet the veteran squad was ambushed and overwhelmed by droves of blood-crazed rebels. Before the vox went dead forever, Sergeant Ladon warned the rest of his brothers that a chaos cult had taken roots far from the light and the eye of the provosts. After hearing the transmission, Captain Geron, whose main objective was to repress the revolt maintaining the productive capabilities of the planet sized labour camp, ordered his company to fall back to the secured upper levels. He then ordered his accompanying techmarines to flood the lower levels with promethium vapour stored in gargantuan sized tanks throughout the planet.

After uttering his final condemnation to the heretics of Hyaela, Geron gave the order to set ablaze the promethium. The blazing inferno spread throughout the tunnel web in a worldwide pyre. The subsequent mopping up operations took only two weeks to carry out, but the planet reached his full production potential only in the closing decades of M41.