The Emperor & Horus (The Prequel to The Horus Heresy - Warhammer 40K) Perhaps some defenders went mad with fear. Perhaps the corruption of Chaos ran deeper than anyone suspected. Perhaps some were foolish enough to think that they could negotiate with the ultimate enemy. Whatever the reason, one last vile treachery was to take place. Many units of the Imperial army that had pledged loyalty to the Emperor turned blasphemer even as the Traitor Space Marines made their drop. It was almost as if it were a pre-arranged signal. In one of the basest acts of betrayal in Humanity's history, they turned their weapons on their brother warriors and cut them down like dogs. Thus did the Lions Gate Spaceport fall to the rebels. As the heretics chanted and howled their mad prayers, the air shimmered and slavering daemons emerged from the warp to spread terror and dismay.