Abaddon's Alpha Strike 000.300.M42 

Bored with his Legion's stagnation in the center of the system Abaddon decides to lead a spear-tip assault personally. After a week long mobilization effort at his behest, a highly elite Black Legion force descends upon Solar Mariatus. 

Somewhere on Vigilatum 000.289.M42

Lenny and Omar milled about on a planet which they only knew as Cadia 6 . All the while smoking chemcigs, and shooting the shit they stood guard; tasked with the protection of a southern entrance to an industrial manufactorum of some importance.  Dust danced around them in tall grey plumes, filling their nostrils with black sludge. Lenny bent over to examine a small golden coin he had spotted on the ground.   

Catastrophic Loss of life 000.272.M42

Prosan of the Cadian system in the Segmentum Obscures has been tectonically compromised. Intelligence suggests that the offending agent is an energy-cannon of immeasurable magnitude. The death toll on the forgeworld has been astronomic; latest reports confirming planet wide social break down, and prevalent rioting.

Third Monthly Cadian Sector Imperial Report 

Operation Competent Siege 000.218.M42 

Two Terran weeks after Ulmar arrives at the space port, he orders his fully operation Bane Blade to be loaded onto a medium corvette. A small fleet of frigates are allocated to the defense of  his prized war machine as it makes for Solar Mariatus. Operation: Competent Siege is initiated.

Second Monthly Cadian Sector Imperial Report

000.098.M42

Immediately after hearing about Aximand's capture, Abaddon dispatches an Astartes kill team. Their task: retrieve Little Horus, and gain intelligence on his captors.

Monthly Cadian Sector Imperial Report

000.055.M42

At the turn of the Millennium direct orders from the Administratum is handed down to Supreme Commander Uskar Creed to route the Black Legion forces from the Cadian System by all means necessary. Forward operating Sergeant Slab is mobilized, and strikes deep into Black Legion territory. Slab and his forces make planet fall; One hundred million Solar Mariatus inhabitants are exterminated with extreme prejudice. Our lord Emperor's force secure a foothold on the planet.

Known Force Dispositions at the Outset of the Thirteenth Black Crusade

+++  The Blessed Forces of the God-Emperor of Mankind +++