Anyway after much persistence he finally buckled and brought his force of Black Templars around to my house in order to face the might of my own Crimson Fists... It's always nice to see the sons of Rogal Dorn smashing the shit out of each other whilst trying to dream up a narrative as to why these erstwhile brothers are fighting each other....
'Damn.' cursed Chapter Master Pedro Kantor as he gazed over the distant horizon and made out the distinctive silhouettes of Black Templars Space Marines moving steadily towards his own position. He shook his armoured head and slowly turned to face the huge form of his second-in-command, a Captain of the Primaris type named Alverez, 'Captain, the enemy approach; assemble your men and move to your ordained positions.'
'Aye Lord' answered the Captain gruffly before turning ponderously in his massive suit of ornate Gravis pattern armour and moving off to brief the two Primaris Lieutenants who waited eagerly nearby. Kantor watched him leave and then turned back to observe his sable clad foe adopting their own pre-battle positions. In his hearts he still struggled to believe that it had come to this, two ancient chapters descended from the lineage of Rogal Down about to engage each other in open conflict when the galaxy was full of far more worthy foes for the Astartes to focus their wrath on... and all because of something so trivial as honour and pride.
The Crimson Fists had arrived on the world of Caldor's Point after the warp storm that had enveloped the planet for the past few millenia had finally evaporated some weeks earlier. This particular world was known to the Chapter from numerous mentions within their archives as having been discovered and conquered for the Imperium by the founder of the Crimson Fists, Alexis Polux, when he had been a mere Commander in the Imperial Fists Legion during the Great Crusade.
This fact meant that by tradition and law their Chapter should be able to claim recruiting rights from the world in order to fill their depleted ranks with new Astartes. The world was ideal for this purpose; as a quasi-feudal planet its indigenous populace were hardy, robust and would make excellent candidates for Space Marine selection. This was very welcome as the Chapter was in dire need of fresh blood following the heavy war of attrition that had occurred on Rynn's World. However on arrival in system the Fists had found that a significant detachment of Black Templars under the command of their own Chapter Master, High Marshal Helbrecht were already making planet-fall with the intention of claiming the world for their own recruiting needs.
The two Chapter Masters had exchanged greetings and Helbrecht had explained that his own records indicated that the world had been conquered by his Chapter's Founder, Sigismund when he too had been an officer in the VII Legion, therefore he stated that his claim took primacy. The two Astartes had initially discussed the matter, and then argued... and then fought over the topic but neither would back down nor concede the claim of their opposite number...and so it had come to this; open warfare amid one of the world's deserted townships. Only one side could win and to the victor would go the spoils...
So there we go, now that we have a story to set the scene, all we need are the forces who will fight this battle: