The 1st Marauder Fleet sped towards the Machina Tertius System to attempt to thwart the Eldar plans for the forgeworld. Their route took the Chaos fleet perilously close to the Imperial shrine world of Stigmata, which was certain to have a defending fleet due to its strategic and religious import.
As expected upon arriving in the Stigmata system an Imperial fleet was detected consisting of:
Glory Hound - Emperor Class Battleship
The Champion of Cherusci - Mars Class Battlecruiser
Star God - Lunar Class Cruiser
Designation unknown - Lunar Class Cruiser