13th Black Crusade - Battle of Tyrok Fields: During the outset of Abaddon's 13th Black Crusade, an act of the basest treachery struck at the heart of the Imperium's defences. At the time, Cadia was alive with the diligent preparations of the servants of the Emperor. Regiments of Cadian Shock Troopers were being mustered alongside the Adeptus Mechanicus' Titan Legions and Skitarii. Regiments of mighty-thewed feral warriors stood alongside the brightly accoutred troops of the Mordian Iron Guard. Amongst this mighty throng, faith welled strong and the morale of every man soared to see the amassed power of the Emperor. But a vile serpent lay ready to strike. The regiments of the Volscani Cataphracts had landed on Cadia to join the muster at Kasr Ty'rok. Yet, in truth, the troops and officers of the Volscani regiments feared to face the Forces of Chaos again, and even if they had not formally pledged their allegiance to the Dark Gods, they had decided that it was better to die in clean battle against men in service to a dark cause than to stand at the gate to the Warp and close ranks in the face of the powers of Hell once more. As the defenders of the Cadian Gate prepared for conflict, the traitorous Volscani Cataphracts revealed their new allegiance to the Ruinous Powers when they unexpectedly struck in force at the Imperial Guard troops being mustered at the Tyrok Fields.The Traitors slaughtered thousands of loyal Guardsmen before any response could be coordinated. The intent of the Volscani's treason was revealed as they swarmed aboard the Leviathan, Excubitoi Castellum, which served as the command vehicle of the Governor Primus Marius Porelska of Cadia. The Traitors proceeded to slaughter him and much of the senior command of Cadia's armed forces. This included the commander-in-chief of the defenders of the Cadian Gate, who was killed in the brutal attack. At the darkest moment, then-Colonel Ursarkar E. Creed took control of the dire situation. Rallying the 8th Cadian Shock Troops Regiment, the bloodied Imperial defenders were quickly organised and ordered to advance upon the Traitors. The 8th Cadian led the charge into the ranks of the Volscani. Creed and Jarran Kell, his Regimental Standard Bearer and most trusted friend, led the way during the counterattack, and it was they who reached the command deck first and succeeded in preventing the foul desecration of the fallen body of the Governor Primus.The Governor had fallen, as a Cadian should, with a blade in his hand and Heretics at his feet. Creed carried the body of the Governor back to the battlements of the Leviathan, wrapped in the banner of the 8th Cadian. Many more Cadian regiments came upon the scene and a great throng of them gathered around. Colonel Creed, being a pious man, allowed them to sing their praise to the God-Emperor and then from his lofty position he delivered his first exhortation to the armies of Cadia, to strive without rest until every disciple of Chaos had suffered the same fate as the Volscani. The host demanded that Ursarkar should take command. Three times he refused the offer, but ultimately he acceded to the will of the massed regiments of Cadia. As ever, greatness thrust itself upon Ursarkar E. Creed and he could but strain to bear its weight. Through Creed's actions, what might have been a grievous defeat for the Imperium and a nefarious victory for the hordes of the Archenemy, was turned into a defining moment for the defenders of Cadia. Every man and woman of the Fortress World swore to repurpose themselves to the defence of the Emperor's realm.