Battles at Hylas reach installation

In the Zadoc subsector the Tau were making progress on New Cerberex but the advance had stalled due to the presence of the Dark Angels. At the same time the Imperium were rushing forces towards the subsector as it was now clear the Tau were launching major operations in the region while the Imperium were busily engaged in the Hadron Expanse and at Mordecai in the Perseus Deeps.

Forces would be slow to assemble in the area however, and the first to arrive in the region was a regiment of Praetorian Guard. Acting on intelligence that suggested Demiurg forces allied to the Tau were seeking to take the Imperial outpost of Hylas Reach, a space station in orbit around a gas giant protecting the warp lane to Hylas itself, the Praetorians decided to deploy on the station in order to head off the xenos assault.

Unfortunately neither the Demiurg nor the Imperium were aware that the orks were also on the move in the Zadoc subsector. Ever since the loss of Zadoc and Tarsis Major, the Imperium had allowed the defences of their two remaining worlds and associated outposts to fall into disrepair, and unknown to the Praetorians the space station had been abandoned. When they did arrive in late 06.023M42, instead of heading off the Demiurg they found themselves in a three way battle on the decks of Hylas Reach between themselves, the orks and the Demiurg.

The battle for Hylas Reach raged for almost a day as the imperial forces tried to gain a foothold. The aggressive orks charged into the praetorian lines holding them back, just as the Demiurg force arrived. The Federacy had been tasked with taking the installations, while the Tau concentrated on the major worlds, but the Demiurg were also not prepared for a fight against two enemies. The Praetorians suffered the most, caught between two hostile alien forces, and were quickly forced back to their breaching locations, while the orks swarmed over the abhuman Leagues of Votan forces. It was not clear to the Imperium where these abhumans originated, but it was widely suspected that this was a force from Hartak, rather than a new expedition from the galactic core, and imperial intelligence continued on the assumption that these forces were part of the Federal-Tau alliance, referring to them using the derogatory term "squats" in the official reports.

The orks didn't care. The greenskins simply swarmed all over their new enemies and soon had taken all the strategic locations on the station. With reports of ork spacecraft in the vicinity both the Praetorians and Votann forces evacuated. Hylas Reach would need to be dealt with in another way.