The arrival of Hive Fleet Behemoth in the Eastern Fringe in 754.M41 would prove to be the single greatest threat to the realm of Ultramar since the darkness of the Horus Heresy. On Macragge, the ancient homeworld of the Ultramarines, would the future of the whole sector be decided. Once the Ultramarines learned of the imminent threat of Hive Fleet Behemoth, Marneus Calgar, Lord of the Ultramarines, ordered Macragge's formidable defences to be placed at a heightened state of readiness. Between a vast fleet of warships and the planet’s mighty orbital defence stations, everyone on Macragge readied themselves to face the Tyranid menace. Only a few scant solar weeks later, the Tyranids’ vanguard fleet attacked. Hundreds of bio-ships swept through the Ultramarines’ blockade and swarmed over Macr