The Red Fox Chapter was created right after the death of Rogal Dorn. It started off as an expedition by the Black Templar to search and destroy the chaos astartes responsible for his death. A list of ten names only known by the High Marshal and the Chapter Master of the Imperial Fists, and of course... the Chapter Master of the Red Fox.
Due to the mystery shrouding this chapter it is hard to know the chapters true origins and background. As such we only have the secret legend that this chapter has over its history. This legend only known and told to astartes by their captains once introduced as astartes who have the right to bear the armor. Once told, the Red Fox Marine will never mention or hear of it again.
Origin/Legend and Background
A secret token with ten names had been discovered and praised to by a cult in a random moon in the Armageddon system. These very names were thought to be the very heros of chaos now worshiped by these cults as the murderers of Rogal Dorn.
Marshal Tensencon of the Black Templar was tasked with this mission to find all chaos traitors responsible for the death of their father and primarch. As they searched for the ten marines, they discovered a horrible truth. Everyone of the chaos traitors that had been captured held the same gene seed that they had. They were sons of Dorn. Sons of Dorn that had killed many years ago in the Iron Cage. Could it be? That such a titan like Rogal Dorn had fallen in the hands of his very own children? They had captured all of the traitors responsible for Rogal Dorn's Death... Except for one... It had been indeed hard. As each one of the traitors were also Iron Warriors. And ever since the Black Crusade in which Rogal Dorn had fallen, the Legions given him less and less support. In Abaddon's most recent Black Crusade, spies told Marshal Tensencon that the Iron Warriors had bailed out of his crusade. This had created a problem. With the last traitor kept deep inside the Eye of Terror, he had no other option but to go straight into the heart of Medengrad and find this warrior.
Marshal Tensencon had made it to Medengrad only to see why he had met little resistance. The Chaos Gods had sent signs to all the Warbands strictly to not attack them. Of course, some had attacked anyway and Marshal Tensencon's Crusaders were lucky they had not been attacked by the chaos warband's true potential. Marshal Tensencon attacked Medengrad directly... only to be beaten into submission as though they were insects charging into a large stone. Marshal Tensencon's Crusaders had been severely beaten and only a handful of survivors had survived the battle only to meat their victors. It is said that a curse had befallen Marshal Tensencon and his Crusaders as Perturabo himself walked towards the Marshal. All their Chapter symbols had misshapen or fallen off their armor as the Mighty Daemon Prince Perturabo walked up to his captured. "You are too late Marshal, the warrior you are looking for has left with Warsmith Honsou's grand company. They have left the planet and have made way to wreck havoc on Ultramar. You have failed. But you will not die, no, you shall travel the universe for all time until you fulfill your task." With that, the Marshal and what was left of his forces were escorted back to their ships along with their fallen brothers.
Marshal Tensencon had left to Ultramar to regain his honor only to be met by Captain Uriel of the Ultramarines. The Marshal had fallen into a forsaken soul. Honsou had been beaten and rumors had been said that he had retreated back to the Iron Warrior planet back in the Eye of Terror. He had failed. His forces had been whipped clean from the records of the Black Templar and the Imperial Fists. He had failed again to accomplish his task. Honsou had wrecked havoc on the world of Calth. Tensencon had been stripped for his rank of Marshal and now he and his chapter were a wanderous warband without purpose. Tensencon had walked by himself for days in the beautiful wilderness of Calth. He had alone trailed a forest for 7 days until he came up to a red hill. He looked upon it and cursed the heavens. He had cursed the Emperor, he cursed his father Primarch and he cursed Perturabo for having given this curse and mercy to live with this pain of his failure. As Tensencon fell to his knees he saw a flash of light before his eyes. It had been said that during that during that sun down on those hills, the Emperor in his young and strong form had come down to talk to him. That hope had not been lost. Rogal Dorn also appeared smiling and proud of Tensencon as he put his arm on Tensencon's shoulder. He had not failed. His mission had only begun. And with that both the figures of Dorn and the Emperor had faded into sparkling dust and then transformed into a figure of a red fox. Tensencon stood up confussed. But he could not move, the red fox ran forward towards Tensencon and yet he could not move at all. The red fox leapt towards the plain black breast plate on Tensencon's chest. The red fox did not land on his chest, but went through Tensencon's chest and in pain Tensencon howled as his chest absorbed the fox form that now became dust being absorbed into his chest. Tensencon had felt went into so much pain that he fell down and passed out.
The next morning Tensencon woke up only to look at his armor. As he looked upon his armor it had a different appearence. His armor was no longer the black color of the Black Templar. It was now crimson red with bronze trim. The plain armor on his chest now had a new emblem.
A crimson armored figure could be seen from a distance as Tensencon's awaited their leader ships at ready. "Halt! Who goes there!" One of the Black Templar's said. "I am Tensencon, Chapter Master of the Red Fox, and I have been revitalized." As the figure came closer they could see their great leader Tenesencon claded in crimson red and the sun gleamed off the center of his chest which had a gold round emblem and in it a black shape of the head of a fox.
Chapter Master Tensencon had told them of what had happened that sundown. And with that all his warriors changed the color of their armor and went down to the Ultramarines treasury requesting any pieces of gold in which they could use to engrave the mark of the fox. After they had fitted and repainted their armor they had a new mission. A mission only known by Tensencon himself. They were off on a crusade that would bring light to the Imperium and that almighty Dorn would be proud himself.