Terra, the homeworld of humanity, and the center of the imperium. It is a shining bastion in the sea that is the galaxy, and where Horus the favored Primarch of the emperor was going to crowned Warmaster over them imperium's forces for all to see. While originally he wanted to do it on Ullanor he decided to gather his sons on Terra to announce that Horus will take over the great crusade while he works on his own special project in his palace made by Rogal Dorn Primarch of the Imperial Fists, which Perturabo and the Iron Warriors found to be an insult to them and which Dorn used to insult them further.
Emperor: By the power vested in me as emperor I name you Horus Lupercal Warmaster over-
Constantine: My lord forgive me, but we are under attack. The PDF and Arbities are currently holding off the forces but are unknown for how much longer.
Horus: Father what should we do?
Emperor: You are now warmaster you decide.
Horus: Well then, send out the legions! deploy any Leman Russ and Baneblades we can in the general area without causing much damage to the surrounding area.
The Primarchs did as the newly crowned Warmaster declared. Leman, Sanguinius, and Corvus called in drop pods because the majority of their forces where in orbit. When they got to the battle field Vulkan at the very sight of humans in peril he sent his Pyre guard to save them while he also protected the humans he saw killing any of the enemy that came to close to him. Roboute Guilliman and his honor guard engaged what appeared to be the strongest units which were mutants. Imperial fist and iron warriors showed up and started to capitalize on any weaknesses that the enemies lines showed.
empires POV
Commander: What are these Demi-humans? They are monsters on the battle field, coming here was a mistake.
Lieutenant: Commander what should we do?
Commander: We run, fall back to the gate. We will taste no victory here.
3 hours later.
Rememberancer: Casuties, 30 PDF/Arbities and over 2,000 civilian deaths or missing. No Legion Astartes casualties however.
Horus: Thank you, alright brothers and sons we must go to the other side and establish a foot hold and set up reconnaissance parties. The Iron Warriors and Imperial fist will build fortifications while the Salamanders, Emperors children, and Wold bearers will be the reconnaissance parties for the fact the populous loves them and could convince many people on that side to join us. Iron hands and Death guard will wait in the fortifications for their endurance.
Later
The legions did as they were told. The two responsible for defenses made them, while the other two legions set themselves up in positions of defense. Then the armies attacked again which were repelled, thanks to the Death Guard using Gas grenades which are filled with gas from Barbarus, while the Iron hands with curtesy from the Iron Warriors installed turrets which connected with their cybernetics to improve accuracy of their shots.
At the empires senate building
Random ass soldier: My emperor, these solderers from the other world they are monsters made into flesh! They have giants in dragon armor who spew out fire from staffs and from their hands. Strange gas clouds appear where a spell casters from their army cast a spell, and when it touched us it melted the skin from our bones. I plead to you emperor Molt don't engage them it would end us!
Molt: Thank you soldier. Alright senators, we must call our vassals to join the war, considering we have lost over 60% of our army they might get ideas. All those in favor?
83%of senators: Aye!
17% of senators: Nay!
Molt: The aye's have it. We are at war!
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The council and Imperium
Fanfiction(this is pre heresy where the imperium is at it's strongest) When the emperor heard wind of another Human Colony he dispatched Horus and Gulliman to take it. But found his son among the colonist that was conquered. Now he leads the Sons of Malice...