On a planet under siege by Chaos, a few great heroes came.
The Chaos forces are attacking a planet named Incus, the human natives are struggling to hold their own, and they prayed for heroes to come. The Emperor responded. Right from his own armies, and other races armies, he teleported them to Incus, to fight the Chaos threat and save the planet. The planet is not on any starmap, nor has it ever been heard of, it is a lost human colony.

Lt. Colonel Duponti of the 831st Forinian crashed onto the soft ground with a loud thud. Several more thuds was heard, Duponti glanced around, his personal retinue of elite Stormtroopers, and his friend Lord Commisar Janis.
"By the Emperor, where are we?" One of the Stormtroopers asked,
"A jungle." Duponti chuckled,
"Well of course Colonel, but what planet? What region?" The stormtrooper asked,
"Don't ask me." Duponti replied, "Everyone form up. Tightly." Duponti said, brushing himself off, he hefted up his boltpistol, "This rocket launcher is too valuable right now. Give me a lasgun." Duponti said, a stormtrooper tossed him an extra Hellgun. "Thanks."
"No problem sir. I see smoke over there, where there's smoke there is fire. It means something is burning." The stormtrooper said,
"Agreed. I also smell some fish... Fisherman perhaps?" Lord Commisar Janis agreed, "Perhaps we are near a river?"
"That would be nice. I like rivers." Duponti said, "Lets move out. Janis, you take point."
"Yes, Colonel." Janis joked, he hefted up his power fist and laspistol, "Come on you apes, lets get some fish for breakfast." He said,
"Sir, its actually midday right now. Look at the sun." A stormtrooper corrected, Janis looked up,
"Ah, you are correct. Well then, lets get some lunch, shall we?"
"Haha, yes sir!" The Stormtroopers laughed.

Duponti peered through the binoculars, looking at a large fishing village.
"A human fishing village." Duponti said to the others, "Empty."
He scanned the area, "Found them, near the outskirts of the village. Seems that they are under attack. A firefight, good tech for a village." He said, "They have autogu- Wait a second, Chaos Space Marines... Janis, who are they?" He asked, handing Janis the binoculars. Janis looked through them,
"They look like... Word Bearers, fanatical bastards." Janis said, "Wait a sec, I see bolter fire coming from the human lines. Woah woah, that's a Salamander Space Marine. What's he doing there?"
Anzi growled underneath his helmet, the Word Bearers dared to attack his village, they would not get off so easily for this offence. Anzi shot several more Word Bearers with his bolt-pistol, and then charged. He activated his power sword and the blade exploded with power, white hot flames shot out from the blade, engulfing it, in addition to the power field. He sliced a word-bearer in half, literally cutting through his armor like a hot knife through butter, the flames spread to the two slags of body, incinerating flesh and melting armor.
"That marine is wearing Mk.3 Powered Armor, he has a Salamander Hide Mantle on him, and a rather powerful power sword." Janis reported,
"Well ain't you the expert." A Stormtrooper remarked,
"Hey, didn't you fantasize about being a Space Marine when you were a kid?" Janis laughed, "I just got a bit overzealous about it. Eldar incoming from the east, they are flanking the Word Bearers. Chaos guys' got numbers though." Janis reported again. "Looks like the Eldar and humans are allied. They are careful not to shoot one another."

"Stormtroopers! Long range engagement time!" Duponti yelled, each stormtrooper took off his backpack and attached a scope and new barrel to their modifiable Hellguns, the Hellguns could now be considered longlas-guns. They took positions along the high mountain ridge and began to fire at the Chaos Marines, the bright red lances would sometimes glance off, some would hit the armor, and very little would pierce the armor.

"To the west! Imperial Astartes, I don't recognize the Chapter. They are pretty close to the firefight. Radioman! Raise them, tell them everything we've seen!" Janis commanded, the radioman nodded and took off his backpack radio, he flipped several switches.

"This is Bravo Niner Niner, to Imperial Astartes, do you read?" The radioman began, "Damn, no way to tell if they are receiving." He cursed, he went on anyways, "Astartes, there is a firefight nearby. Against Word Bearer Chaos Space Marines, there are human and Eldar forces present and they seem to be allied. We are providing long range support, I suggest you help us rescue this village, great source of intel right here, and we'll get on the right foot with the natives... Oh, and one more thing. There is a Salamander Space Marine here, really old armor. Seems pre-heresy, sirs."

Anzi looked up at the bright red lances, lasguns! There were Imperial Guard here! He grinned, "Come men! The Imperial Guard is here, let's not disappoint them!" He yelled, the fisherman yelled in acknowledgement back. He glared at one Chaos marine and exhaled loudly, white fire began to form around the grills of his helmet, and almost instantly, fire shot out from his helmet at the Chaos Marine. The flames bathed the Chaos marine in fire, it seemed to burn everything in and on him, like it was purifying the chaos within the chaos marine.

The Knights were approaching their destination to investigate the blast, they are armed and ready to purge all who stand against them..."And I was like, MotherFether please! Raised my bolter then BAM! Bye bye Cultist." Brother Arathan said. "Wow. You actually spoke to the cultist before you killed him?" Brother Darius said. The Captain raised his hand and clenched it close and tight, the Knights ceased their chatter and got to their positions. "Ser we are receiving transmission" The Communications officer said.

"This is Bravo Niner Niner, to Imperial Astartes, do you read?" The radioman began, "Damn, no way to tell if they are receiving." He cursed, he went on anyways, "Astartes, there is a firefight nearby. Against Word Bearer Chaos Space Marines, there are human and Eldar forces present and they seem to be allied. We are providing long range support, I suggest you help us rescue this village, great source of intel right here, and we'll get on the right foot with the natives... Oh, and one more thing. There is a Salamander Space Marine here, really old armor. Seems pre-heresy, sirs."

"This is Captain Geren Grieves 5th Company of the Black Sons Chapter. We receive you loud and clear. We shall intercept."
The Black Sons could see the battle just as what was reported to them, Eldar and Humans fighting side by side against a common foe, Chaos. The Devastator Knights went on top of the hill top to get a better sight of the battle as well as a vantage point. The Assault Knights went behind enemy lines and waited for further orders.
"STRIKE FROM THE SKIES MY BROTHERS!" The Captain Ordered. Immediately the Knights attacked from different directions, vanquishing every Heretic they could encounter. The Chaos forces were shocked from the sight of Imperial reinforcements, they were getting overwhelmed. From the Tree line a hail of bolter fire was heard from a distance, the Dreadnought fired his Assault cannon unto the Chaos marines, non were spared. The Eldar and Human forces took cover immediately as they saw Black and Crimson Red armoured marines. From behind them a Khorne berserker managed to get to them unnoticed, from above a Knight came barring down, with his chainsword at hand revved up as well as his bolter he swished his chainsword in an Arc vertical way slicing the Heretic into two. "In the Emperor we Trust." he said as he walked away from the body of the fallen.