Sanguis Vicos

The Sanguis Vicos is the name of the Imperial campaign conducted by the Argent Leviathans Space Marine Chapter against the notorious Flawless Host Chaos Warband when they attacked the Argent Leviathans' Chapter homeworld of Caerule.

History
Once word got out that the Chapters homeworld was to be attacked, every asset the chapter had access to was recalled back to Caerule in order to defend it. However, the assault came sooner than expected leaving the civilians vulnerable. The forces of the Flawless Host came upon the capital of Kar'Morgh where most of the forces were garrisoned, however, they had all the civilians inside the large chapel of Aquaenius Hall. All of the Chapters Companies were present to fight for their home with the 4th Company left to defend the Fortress-Monastery and some left in orbit to board the enemies ships. Lord Magister Daethos Kordavius led the charge in Kar'Morgh with his Kraken Praesidio cutting through waves of the traitors, hoping that the enemies would withdraw once their leader died he began hunting down their Lord, Eleaxus the Flawless.

Above the planet itself, the Chapters Fleet fought a relentless battle against the tainted ships if the Slaaneshi Warband. The enemy ships were more numerous but had much weaker armaments and armour compared to the Chapters Strike Cruisers and Battle Barges. By the 14th day, the fleet had destroyed all but one of the enemies ships by torpedos and boarding parties, however, the Warbands ships managed to destroy the Battle Barge Furore Cessabit. The only ship that remained was their Flagship, a monstrosity of warp taint and metal.

On the fifteenth day of battle, Kordavius and his strike team of Kraken Terminators had tracked Eleaxus down to Aquaneius hall, inside a large group of civilians being gruesomely tortured by members of the Flawless Host. The Possessed had yet to notice them but if they engaged the heretic forces Kordavius could run the risk of allowing Eleaxus to get away. But by the time he had hunted him down the traitor marine was being teleported back to his flagship, leaving Kordavius and by extent, the entire chapter with a burning hatred that would burn on the tinder of the countless more times the Chapter would encounter the Warband. Eventually, the Warband retreated after a large amount of Melta Charges were detonated during a battle, decimating their ranks yet killing many civilians.

By the end of the assault, the streets ran with blood, of loyalist, traitor and civilian alike. The chapter had lost over 340 marines by underestimating their enemy as they had not prepared for an assault of this magnitude. 63% of the Population of Kar'Morgh had been killed by the Traitor forces. After this, the chapter stopped fighting in large Battles until they had fully regrown their strength.