Legio Magna - Notable Campaigns: Schism of Mars (005-006.M31) - Later Imperial histories record that the first blow of the Martian civil war unleashed during the Horus Heresy that was known as the Schism of Mars was struck against Magos Mattias Kefra, whose forge in the Sinus Sabaeus region of the Red Planet was housed within the Madler Crater. Titans of the Legio Magna marched from the southern Noachis region and within minutes had smashed down the gates of his forge city. Howling engines daubed in red, orange, yellow and black and decorated with flaming horned skull devices, ran amok within the high walls of the crater, crushing everything living beneath them and destroying thousands of years of accumulated wisdom in a fury of fire. Vast libraries burned and weapon shops that served the Solar Guard Imperial Army regiment were reduced to molten slag as the indiscriminate slaughter continued long into the night.Battle of Ice World Tralsak (011.M31) - The shallow, frozen oceans of Tralsak are flash-boiled to steam by the fury of engine-war as Loyalist Titans of Legio Atarus and Legio Agravides clash with the Traitors of the Legio Magna and Legio Victorum as the Loyalist Shattered Legions and Traitor World Eaters fight across the disintegrating landscape of ice floes. Ultimately, outright victory eludes both sides, and each uses the cover of the world-enveloping fog thrown up by the destruction to extricate their forces and redeploy them elsewhere. Nevertheless, numerous supporting Knights of both sides remain to fight a war in which neither will concede defeat.Battle of Beta-Garmon, "The Titandeath" (006-013.M31) - The Legio Magna took part in the long and savage Beta-Garmon campaign, which included hundreds of war zones across dozens of worlds. During this conflict, the Legio Magna was supported by the Knights of House Atrax. Even before the greater armies of the Warmaster Horus reached the star cluster, the battle lines had long since been drawn, and fighting had been going on for many Terran years. It was a cauldron of battle that would consume millions of lives before its end and see the demise of entire Titan Legions, earning this campaign the dire moniker of the "Titandeath." The Beta-Garmon Cluster, also known as the gateway to the throneworld of Terra, was the last hurdle that the Warmaster Horus' forces had to overcome before they reached the Imperium's capital world. Heavily fortified by the Loyalists, Beta-Garmon would become one of the greatest and bloodiest battles of the Horus Heresy, as well as one of the longest-lasting.Siege of Terra (014.M31) - The Legio Magna took part in numerous engagements during the dark days of the Horus Heresy, but its most notable action occurred when they participated in the Siege of Terra and the assault on the  Imperial Palace alongside the other Traitor Titan Legions.Third War for Armageddon (998.M41) - The planet Armageddon, lynchpin of the Armageddon Sector, is a polluted wasteland of industrial ash and metal. It is a vital node at the centre of one of the Imperium's key navigational channels and its sprawling munitions factories and busy hive cities supply tanks and arms to thousands of Astra Militarum regiments across the segmentum. The Third War for Armageddon began when Ork Roks -- space-borne mountain-fortresses infested with Greenskins and their war machines -- crashed into the ash wastes. Spearheaded by the Ork Warboss Ghazghkull Mag Uruk Thraka, soon the fighting devolved into a thousand different fronts. Taking advantage of the situation to sow bloodshed, misery and terror, the forces of Chaos also flocked to the conflict. Several Traitor Titan Legions, including the Legio Magna, made their way to the industrial Hive World to take part in the slaughter. The Legio Magna attacked the strategically important and vital natural resources of the Netheria Peninsula, which pumped its natural reserves to Imperial facilities. The loss of the Netheria Peninsula would be a disaster for Imperial forces on Armageddon.