At the beginning of the Horus Heresy, the XIII Legion, better known as the Ultramarines, stood among the most powerful military forces in the Imperium, possessing a strength that approached a quarter of a million Legiones Astartes, controlling a vast realm stretching across an entire sector, and maintaining a remarkably efficient system of recruitment, training, logistics, and reinforcement that allowed the Legion to absorb losses that might have crippled other Space Marine forces. This immense strength would eventually make the Ultramarines one of the greatest strategic prizes of the Traitor conspiracy, because destroying or even severely weakening the XIII Legion could remove a vast portion of the Emperor's military power from the coming civil war. The Battle of Calth would ultimately become the most famous expression of this strategy, but the road toward Calth began thousands of years earlier, during the final stages of the Unification Wars on Terra, when the XIII Legion was still an obscure and developing force whose history was considerably more complicated than the heroic image later associated with the Ultramarines.
The public legend surrounding the Ultramarines during the Great Crusade presented them as disciplined, reliable, strategically gifted warriors serving under the command of Roboute Guilliman, but much of the Legion's earliest history remained hidden behind the secrecy surrounding the Emperor's gene-forging projects, incomplete records, and the destruction of countless archives during the Siege of Terra. Beneath the polished image of the later Ultramarines existed a Legion shaped by the violent final years of Old Night, a brotherhood whose earliest warriors had been recruited from some of the most brutal and rebellious populations of Terra and whose initial battlefield identity developed through experimentation, adaptation, and repeated exposure to the methods of other Legions. Long before the XIII Legion became synonymous with Macragge, Ultramar, and the Codex Astartes, it was known by a very different informal title: the War-born.
The Birth of the XIII Legion
Like the other Legiones Astartes, the XIII Legion originated on Terra during the closing years of the Unification Wars, when the Emperor was transforming the fractured remnants of humanity's homeworld into the foundation of a new Imperium. The Legion's first experimental intake, designated its "Alpha" intake, consisted of several thousand warriors whose purpose was to test the stability and adaptability of the Legion's gene-seed and determine whether the implanted biological organs performed according to the Emperor's expectations. The results were considered highly successful, with the gene-seed falling firmly within acceptable parameters and showing no unusual physical mutations beyond the patterns expected from the implantation process.
The psychological characteristics of these early warriors were particularly significant because the XIII Legion displayed a combination of aggression and discipline that distinguished it from several of its contemporaries. The recruits naturally possessed the increased aggression expected from Astartes implantation, yet they also showed an unusually strong tendency toward cohesion, hierarchy, obedience, and relentless dedication to assigned objectives. Compared with the early genetic samples associated with the XII Legion, later known as the World Eaters, or the V Legion, later known as the White Scars, the XIII demonstrated considerably less individualistic and fractious behaviour after implantation. Instead, the emerging Legion displayed an instinctive willingness to function as a collective military organism, an attribute that would become one of the defining characteristics of the Ultramarines.
The exact circumstances surrounding the Legion's earliest expansion remain uncertain because much of the surviving evidence is fragmented or deliberately obscured, while additional records were destroyed during the devastation inflicted upon Terra and the Imperial Palace during the Siege of Terra. Nevertheless, the available evidence indicates that the XIII Legion recruited warriors from an extraordinarily diverse collection of Terran societies, including the sub-equatorial maglev clans of Panpocro, the war families of the Saragon Enclave, the Midafrik Hive Oligarchy, and the anthropophagic tribes of the Caucasus Wastes. These populations differed greatly in culture and social organization, yet they shared a crucial characteristic: all had resisted the Emperor's Unification with extreme violence.
The resistance of these groups had generally not ended through negotiated settlement or peaceful integration. Instead, the wars that brought them beneath Imperial authority had often resulted in near-annihilation, leaving behind scattered survivors, refugees, and orphaned populations. The XIII Legion therefore absorbed into itself the descendants and remnants of peoples who had experienced the most brutal stages of the Unification Wars, and this origin became the foundation for the name by which the Legion was informally recognized by other Imperial forces: the War-born.
It is possible that this was not simply an accidental consequence of recruitment. The psychological characteristics produced by the XIII Legion's gene-seed may have been deliberately useful during the final stages of the Unification of Terra, allowing the Emperor to transform populations hardened by violence and rebellion into warriors capable of serving the new Imperium. In this interpretation, the creation and recruitment of the XIII Legion formed another component of the Emperor's broader strategy for turning the brutal societies of Old Night into the military strength of the civilization he was constructing.
Interestingly, there is no surviving evidence that the XIII Legion participated extensively in the final battles of the Unification Wars on Terra itself. Other early Legions, including the VII Legion and VIII Legion, later known as the Imperial Fists and Night Lords, had already accumulated direct battle honours during the violent campaigns that brought Terra under the Emperor's control. The XIII Legion's earliest recorded major honours instead came beyond Terra, beginning with the First Pacification of Luna and the brutal Sedna Campaign at the edge of the Sol System.
These campaigns marked the beginning of the Legion's transformation from an experimental Terran force into an active instrument of the Great Crusade.
The War-Born Enter the Great Crusade
As the Great Crusade began expanding humanity's domains beyond the Sol System, the Emperor's armies encountered countless Human civilizations that had survived the collapse of the Dark Age of Technology. Some worlds welcomed the Imperium as a protector and patron, while others rejected Imperial Compliance because they believed their own civilizations were sufficiently powerful to survive independently. Other Human societies had fallen beneath the domination of xenos powers and required military liberation before they could be incorporated into the Imperium.
The XIII Legion participated in this expansion during its earliest years when it numbered approximately 8,000 Astartes, serving alongside other Legions under the Emperor's direct generalship. During this period, the Legion began accumulating an impressive series of victories, participating in campaigns such as the Liberation of Diurnus and the destruction of the Scorvidian xeno-empire while also conducting successful independent Compliance operations on worlds including Lorin Sigma, Sekel's Landing, and Ne'deble.
Each conquered Human civilization could potentially contribute new recruits to the Legion, particularly from populations whose warrior traditions made them suitable candidates for Astartes implantation. In this way, the XIII Legion's recruitment network expanded alongside the Great Crusade itself, repeating on other worlds the process that had begun with the War-born populations of Terra.
The early Great Crusade also revealed one of the most important features of the Emperor's design for the Legiones Astartes. Although every Legion possessed the fundamental capabilities required to fight across a vast range of environments, each gene-line displayed distinct characteristics that made it particularly effective in certain forms of warfare. The IX Legion, later known as the Blood Angels, displayed an extraordinary capacity for controlled fury, while the XIV Legion, later known as the Death Guard, developed a reputation for exceptional resilience. The VIII Legion became associated with psychological terror and oppressive darkness, while the X Legion, later known as the Iron Hands, developed an affinity for technology, cold determination, and relentless mechanical warfare.
The XIII Legion occupied a different position within this spectrum. Its strength came from the combination of aggression and restraint, discipline and determination, flexibility and organizational cohesion. These characteristics made the Legion exceptionally well suited to joint operations in which different military forces had to function together under a unified command, while also allowing the XIII Legion to operate independently across multiple theatres of war.
Masters of Adaptation
The XIII Legion's battlefield philosophy was fundamentally based on adaptation. Rather than developing a single rigid method of warfare and applying it regardless of circumstances, the Legion studied the methods of the forces around it and incorporated whatever proved effective into its own doctrine. This made the XIII Legion unusually versatile and allowed its warriors to operate effectively alongside a wide variety of Imperial formations.
One particularly important area of expertise involved cooperation with the mortal armies supporting the Great Crusade. The XIII Legion could take direct command of Imperialis Auxilia forces, including professional Solar Auxilia formations, the regiments of the Old One Hundred, and less disciplined Imperialis Militia units that had recently been forced into Imperial Compliance.
This willingness to manage ordinary Human soldiers distinguished the XIII Legion from some of its fellow Legions. Other Astartes formations could regard such responsibilities as beneath the dignity of the Legiones Astartes or as an inefficient use of Space Marines, but the XIII Legion viewed them as another part of the military problem that needed to be solved. When necessary, Legion warriors could even be detached as provosts and disciplinarians, enforcing Imperial authority among newly conquered forces while simultaneously encouraging courage by fighting at the front.
Their tactical development was therefore not isolated from the rest of the Great Crusade. The XIII Legion absorbed lessons from the cultures and military formations it encountered, borrowing everything from the knife-fighting traditions of the Opaki gangs of Hive Kôr to the armoured warfare methods associated with the X Legion. They also studied the approaches of more famous Legions, including the Luna Wolves and the I Legion, later known as the Dark Angels.
The result was a military culture in which imitation was not considered weakness. Instead, the ability to observe another force, understand what made it effective, and incorporate those lessons into a new tactical system became one of the XIII Legion's greatest strengths.
The Brotherhood of the Thirteenth
By the third solar decade of the Great Crusade, the XIII Legion had developed a distinct identity. Its warriors were described as practical and forthright, preferring direct action over esoteric theories of warfare or excessively complicated strategic speculation. Their preferred approach was to establish tactical objectives quickly, determine what needed to be accomplished, and then achieve those objectives through battlefield experience, coordination, and disciplined aggression.
The Legion was nevertheless proud of its achievements and developed a competitive relationship with other Legions, particularly those whose Primarchs had already been rediscovered. The XIII Legion wanted to prove that it could stand among the Imperium's greatest military forces even without the presence of its own Primarch, and its repeated victories strengthened both its confidence and its reputation.
This pride was also reflected in the appearance of individual Legion companies. Unlike some Legions that adopted a single elaborate visual identity across their entire force, the XIII Legion allowed companies to commemorate their greatest campaigns through additions to the standard Legion appearance. At this stage, the Legion retained the storm-grey and gunmetal colours associated with its post-Unification origins, but individual formations could add heraldry representing exceptional victories.
One example was the company that had fought alongside the VIII Legion during the destruction of the abhuman corsairs of the Cancerai Nebula. Following the campaign, these warriors adopted black gauntlets, midnight-blue helmets, and the Terran symbols of weighing scales and the death's head associated with judgement. They took the name Nemesis to commemorate their achievements.
Another formation consisted primarily of armoured warriors who had fought against an Ork advance across the ash plains of Cypra Mundi. After saving a city containing millions of Human inhabitants, they incorporated the emerald colour of the blazing armour borealis that had illuminated the battlefield into their heraldry.
Despite these individual distinctions, the Legion did not initially seek a grand collective title beyond its numerical designation. The XIII was considered sufficient. Its first Lord Commander, Gren Vosotho, is recorded as having rejected the superstition surrounding the number 13, declaring that the Legion would transform the supposedly unlucky number into a symbol of redemption and glory through service to the Emperor.
The XIII Legion would soon receive an opportunity to prove that claim under circumstances far more dangerous than anything it had previously encountered.
The Rise of the XIII Legion
By 833.M30, the XIII Legion had expanded to approximately 33,000 Space Marines and operated primarily through the autonomous 12th Expeditionary Fleet. Its rapid growth was driven by two major advantages.
The first was its unusually efficient approach to warfare. The XIII Legion generally attempted to avoid unnecessary casualties and rejected battles of attrition whenever alternative methods were available. Victory was important, but so was the cost required to achieve it. Strategic objectives were therefore pursued with the minimum expenditure of lives, and when Human populations or infrastructure could be preserved, the Legion generally attempted to reduce civilian casualties and unnecessary destruction.
The second advantage was hidden within the Legion's gene-seed. Although its implantation success rates were close to the general median, the XIII Legion's genetic material proved exceptionally resistant to replication errors. Its stability was matched only by the core gene-seed associated with the I Legion, allowing successive generations of Astartes organs to be produced with relatively little mutation or deviation.
This was especially important because the XIII Legion achieved this genetic stability before it possessed the stabilizing influence of its Primarch's mature gene-code. The Legion could therefore maintain a remarkably consistent recruitment and implantation system while continuing to expand.
Its genetic stability and organizational independence eventually became so significant that the XIII Legion's 12th Expeditionary Fleet was entrusted with an enormous responsibility. While the Emperor, Ferrus Manus and the X Legion, and Horus and the Luna Wolves pushed major Crusade thrusts outward into the distant regions of the galaxy, the XIII Legion was tasked with exploring and securing the densely populated inner galactic disc closer to Terra.
This responsibility placed the XIII Legion in a strategically important position, and it was this role that brought it into one of the most disastrous campaigns in its early history.
The Osiris Cluster Rebellion
The Osiris Cluster consisted of 11 star systems located in the inner portion of the Segmentum Solar's second quadrant. The worlds of the cluster had originally entered Imperial Compliance during the eighth standard year of the Great Crusade, and their incorporation had been comparatively peaceful, with the XIII Legion itself contributing to the successful campaign.
Centuries later, the region suddenly declared its independence from the Imperium.
Imperial merchant vessels were seized, Imperial Armada patrols were attacked and driven away by local defence forces, and agents of Imperial authority disappeared. What had once been regarded as a successful example of Imperial Compliance had apparently transformed into an open rebellion.
For Lord Commander Gren Vosotho, the rebellion was not merely a strategic problem. It was an insult to the honour of the XIII Legion. The Legion had helped bring the cluster into the Imperium, and Vosotho was determined to demonstrate that rebellion against Imperial authority would not be tolerated.
His response was rapid and aggressive. The 12th Expeditionary Fleet advanced toward Septus XII, leaving behind slower support vessels and transports protected by the fleet's less mobile combat ships. Vosotho intended to strike directly at Cabasset, the major political and economic centre of the cluster, located within a vast environmentally sealed city on the planet's night side.
The plan relied upon a decapitation assault. By destroying the governmental and environmental control complexes on which Cabasset's population depended, Vosotho believed the rebellion could be ended quickly while avoiding the unnecessary destruction of the planet's infrastructure. The strategy was inspired in part by techniques observed among the Luna Wolves and was considered consistent with the XIII Legion's preference for rapid, decisive operations.
But Vosotho's intelligence was catastrophically wrong.
The Attack on Septus XII
The initial stages of the attack appeared to confirm the Legion's confidence. The flagship of the expeditionary fleet, the Goliath-class macro-battleship Sethaln's Thunder, provided close support while Vosotho personally led Stormbirds into the outer shell of Hive Cabasset. The Imperial assault force expected determined resistance from rebel forces, but what it encountered was something far more horrifying.
Hundreds of civilians soon became thousands, advancing toward the Space Marines in improvised pressure suits while carrying crude weapons and explosive mining charges converted into suicide devices. These people did not fight with normal military discipline, nor did they display the ordinary instinct for self-preservation expected from Human combatants. They simply continued advancing.
The XIII Legion adapted immediately, modifying its tactics to inflict maximum casualties on the advancing masses, but the enemy remained almost completely indifferent to its own losses. The Space Marines began to understand that this was not a conventional rebellion.
Vosotho nevertheless refused to abandon the attack. Reinforcements were committed, and the Legion pushed deeper into the hive, relying upon speed, coordination, and its overwhelming superiority in close combat. Tactical objectives were gradually seized as the Astartes fought through increasingly desperate resistance, including formations that appeared to have once served as elite bodyguards for the city's nobility.
Then the true trap was revealed.
A xenos fleet suddenly emerged from within the fiery corona of Septus' star. The alien vessels were immense hourglass-shaped structures that rotated continuously like enormous mechanical devices, and each one possessed a mass greater than the gigantic Sethaln's Thunder.
Vosotho immediately recognized the scale of the disaster and ordered a general withdrawal.
But retreat was already extremely difficult. The aliens attacked the Stormbirds attempting to extract the Legion's warriors, while enormous numbers of civilians poured from corridors and side passages, attempting not simply to kill the Space Marines but to physically overwhelm them, pinning individual Astartes beneath masses of bodies regardless of how many civilians were killed in the process.
Above the planet, the 12th Expeditionary Fleet fought an equally desperate battle.
The strange xenos ships possessed weapons capable of unleashing devastating particle energy while also generating collapsing gravitational singularities that annihilated approaching fighter craft and torpedoes. The Imperial fleet was completely outmatched in firepower and size, yet continued fighting.
One of the enormous alien vessels was damaged badly enough to withdraw from the engagement, but the XIII Legion paid an enormous price. Twelve Imperial warships were lost, while Sethaln's Thunder was reduced to a burning wreck drifting helplessly through the battle.
Then the creatures themselves appeared.
Figures surrounded by baroque biomechanical containment suits materialized among the fighting forces, both on the planet and aboard the Imperial vessels. Their bodies appeared barely physical, taking the form of glowing mist within their armour, while their weapons emitted strange forms of ethereal energy and their minds possessed the ability to crush or dominate those who resisted them.
The enemy was not simply technologically superior. It possessed terrifying psychic capabilities and methods of warfare that the XIII Legion had never encountered.
Vosotho's final order was simple: the surviving Imperial forces had to withdraw and report the existence of this new enemy to Terra.
The Legion's Lord Commander remained behind to command the rearguard, accepting responsibility for the disaster that had resulted from his assumptions and his failed intelligence. Before his death, he transferred command of the Legion to the senior surviving commander in orbit, First Master Marius Gage.
Gage then performed the extraordinary task of holding the alien vessels at bay long enough for every surviving Stormbird from the surface assault to escape. His forces fought a constantly shifting three-dimensional battle of attack, withdrawal, counterattack, and evasion until the surviving elements of the 12th Expeditionary Fleet finally escaped the system.
The XIII Legion had been defeated, but it had not been annihilated.
The Cost of Defeat
The losses suffered at Septus XII were unprecedented in the history of the XIII Legion. More than 6,500 Space Marines had been killed, representing approximately one-fifth of the Legion's fighting strength at the time. Worse still, the dead included many of the Legion's most experienced Terran veterans, along with Lord Commander Gren Vosotho himself.
The fleet had suffered similarly severe losses, with roughly one-quarter of its warships destroyed or damaged beyond practical recovery. The flagship itself had been lost, while the Legion's reputation for efficient and controlled warfare had suffered a profound psychological blow.
The XIII Legion had always taken pride in its ability to achieve objectives without wasting lives. Septus XII represented the complete opposite of this philosophy. The Legion had entered the battle confident in its intelligence, underestimated its enemy, committed itself deeply into hostile territory, and then discovered that almost every assumption behind its plan had been false.
The survivors therefore did not simply mourn their dead. They questioned themselves.
When the XIII Legion returned to the Osiris Cluster less than a year later, it did so with substantial reinforcements drawn from the Solar Armada, elements of the XVIII Legion, later known as the Salamanders, and specialist anti-psyker forces from Terra. Yet the xenos designated by the Officio Biologis as Osiran Psybrids were nowhere to be found.
Instead, the Imperials encountered devastated worlds filled with unburied dead and societies consumed by civil conflict.
The investigation revealed a terrifying pattern. The alien entities had apparently operated secretly before openly revealing themselves, manipulating Human populations and destroying the ability of entire societies to function. On some worlds, they had burned away the wills of their victims, abducted others into the void, and left the remaining population incapable of even maintaining its own survival. On other worlds, they had manipulated rulers and populations through psychic domination, exploiting fear and paranoia until rebellion and civil war erupted.
The enemy might not have been numerous, but its combination of psychological manipulation, psychic power, technological superiority, and strategic secrecy made it an exceptionally dangerous threat.
The Imperium therefore marked the Osiran Psybrids for extermination.
The Blood Oath of the XIII Legion
The campaign to restore Imperial authority over the Osiris Cluster produced none of the glory that the XIII Legion had once sought through its victories. The surviving worlds were secured and prepared for repopulation, but the enemy itself had vanished.
The Legion responded by swearing a blood oath of vengeance.
Marius Gage assumed command as the new Lord Commander and Legion Master, reorganizing the XIII Legion and beginning the enormous process of replacing its losses, rebuilding its fleet, and restoring its supplies. The Legion then returned to the Great Crusade with renewed determination, winning campaign after campaign in an attempt to prove that the disaster at Septus XII had been an aberration.
Yet the defeat left a permanent psychological scar.
The name of Gren Vosotho became something that was rarely spoken, while the battle itself remained like a shadow behind the Legion's victories. The XIII Legion had once competed openly with its fellow Legions for honour and recognition, but now it became increasingly reluctant to celebrate its own achievements.
More importantly, the survivors began to feel that something was missing.
They had fought successfully for the Emperor, conquered worlds, developed a reputation for discipline, and built an increasingly formidable military organization, but they had not yet been reunited with their Primarch.
Unbeknownst to them, the Emperor had already located Roboute Guilliman more than two Terran years before the disaster at Septus XII. The Legion simply did not know it, and the unpredictable nature of the Warp meant that contact with their lost Primarch would not yet be possible for several more standard years.
For the XIII Legion, however, those years seemed almost eternal.
They continued fighting across the galaxy, taking world after world for the Great Crusade with relentless efficiency, but the character of their victories had changed. They no longer pursued glory with the same enthusiasm, and they no longer cared as deeply about the admiration of their fellow Legions. Instead, every campaign became another opportunity to prove that they were still worthy of the name XIII Legion and that the terrible defeat at Septus XII had not defined them.
Their salvation was approaching, although the warriors of the XIII Legion did not yet know that the man who would transform them forever was already waiting somewhere beyond the uncertain paths of the Warp.
When Roboute Guilliman was finally brought into their midst, the War-born Legion would begin the transformation into something far greater than the Emperor's original XIII Legion, becoming the Ultramarines of legend and eventually the foundation for a vast lineage of Space Marine Chapters whose influence would survive for 10,000 years.
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