On Mordecai the focus of the imperial campaign shifted south towards the city of Ur'Ghar on the shores of the Kuneus lava traps. The twin cities of Burroneus and Ur'Ghar were the gateway to the Sathugar mines and it was critical for general Kutuzov to take both and hold them. Burroneus had changed hands a number of times but was now firmly in imperial control, but Ur'Ghar still held out.
To take the city the imperial guard would make a strong flanking manoeuvre to cut the city off from supply, and the elite Adeptus Custodes would then conduct a frontal assault on the city. By late 11.022M42 it was determined that the forces in Ur'Ghar were weak, but that the forces of chaos would almost certainly summon daemons to do the fighting for them.
The operation to take Ur'Ghar played out as expected by the Imperium. As the Novgorod Hussars pushed north to encircle the city, a host of daemons was summoned in their path. Expecting this, the Hussars were well equipped, and although the army was not the largest imperial force to be sent on an offensive, the majority of the chaos army was being kept in the city itself as a frontal assault was expected. The Novgorod regiment performed its duty however, and reached the shores of the Kuneus traps on schedule.
With the city of Ur'Ghar now surrounded, the Adeptus Custodes launched their attack, knowing that direct reinforcement would not be available to the armies of chaos. Brutal fighting erupted in the streets of the city, and a great host of daemons was summoned to oppose the elite imperial attackers. These deamons included a greater daemon of Khorne and what appeared to be a manifestation of Belakor himself, but the Custodes force, supported by a legendary Telemon heavy dreadnought proved more than a match for the denizens of the warp. One by one the monstrous abominations were cast back into the warp, and the chaos positions in Ur'Ghar became untenable. With nowhere to run the battle became a slaughter, as the loyalists massacred anyone and anything flying chaos colours. No prisoners were taken, and the city was all but razed to the ground. Only a few that had stayed loyal to the emperor were spared the fire.
The chaos forces were not done however. Unable to retake the city, the Thousand Sons nevertheless took the opportunity of the concentration of imperial forces in the south to launch a series of raids against imperial defences further north in the central sector. Here they managed to draw the attention of the Dark Angels, who they defeated in open battle, killing a senior astartes commander. This did not result in territory gain for the chaos forces, but it reminded Kutuzov that his enemy still possessed strong and well equipped units, and the war although tipping in the Imperium's favour, was far from over.