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Battle of Trisolian

2022-04-24T12:45:42Z

2603:8001:6901:2586:B96C:8554:D60C:74FE: /* The Battle */

{{Infobox 40k Campaign
|title=The Battle of Trisolian
|image=
|attacker= [[Space Wolves]]
|defender= [[Sons of Horus]]
|commander1= [[Leman Russ]]
[[Belisarius Cawl]]
|commander2= [[Horus]]
|date= ~011.M31
|scale=Void battle
|theatre= Horus Heresy
|strength1= ~40,000 Marines, the near entirety of remaining Space Wolves; majority of fighting forces on a sizable loyalist Forge World
|strength2= ~50 capital ships; [[Sons of Horus]] Legion; considerable elements of [[Word Bearers]], [[World Eaters]], [[Alpha Legion]], [[Night Lords]] & [[Iron Warriors]]; Mechanicum Traitors
|casualties1= Extremely High - Maximum ~25,000. Some companies reduced to 20% strength.<br> Unknown number of Mechanicum loyalists - presumably high, but a sizeable amount survived past the end of the war
|casualties2= Extremely High - Number unknown. Higher number & percentage than the Space Wolves, but with sufficient reserves to absorb the losses largely unphased
|status= Imperial retreat
|outcome= Space Wolves retreat to Yarant and prevented from returning to participate in the [[Siege of Terra|Siege]] in time.<br> Effectively ended the VIth as a "Legion".<br> Horus badly wounded/partly de-corrupted.<br> Leman Russ badly wounded and/or traumatized.
}}

The '''Battle of Trisolian''' was the ill-fated attempt by [[Leman Russ]] to kill [[Horus]] before the inevitable [[Siege of Terra]]. It also marks the earliest appearance of a young [[Belisarius Cawl]] who is a mere up-and-coming but still notoriously unconventional tech-adept by this stage.

==Background==
Throughout the Horus Heresy, the Space Wolves were at the forefront for many of the most vicious battles. Loud space viking appearances and antics notwithstanding, the VIth Legion and their primarch, [[Leman Russ]], always took their role as The Emperor's executioners very seriously, and so threw themselves into the thick of things quite often throughout the heresy. Fights they evidently mostly won, but which inevitably took a toll on manpower and material. Additionally, for at least the first half of the war, contact could not even be established with the [[Blood Angels]], [[Dark Angels]], and [[Ultramarines]] as they were trapped behind the Ruin Storm, and with the other [[Salamanders|loyalist]] [[Raven Guard|legions]] [[Iron Hands|indisposed]], [[Imperial Fists|detained]], or [[White Scars|otherwise]] [[Custodes|occupied]], this resulted in the Space Wolves being engaged far more frequently than was ideal, without being rotated out of the front lines, and so no time to rest, receive repairs, or take on new recruits. By late in the war, the Wolves had lost around 25% of their forces at [[Burning of Prospero|Prospero]], taken further maulings at the [[Battle of the Alaxxes Nebula]], coupled with further engagements at Vanaheim and Daverant, ultimately reducing their numbers down to around forty thousand marines (give or take), after having started the Heresy with approximately one hundred and thirty thousand. Following Alaxxes, the remnant returned to Terra to coordinate with the loyalist forces.

Leman Russ sponsored a stealth mission by the [[Knights-Errant]] on the Vengeful Spirit during the '''Battle of Molech''' in order to gauge any weaknesses in the traitor dispositions and report back on the state of Horus himself. However, the mission went sour when they were discovered, leading to the deaths of several of the Knights-Errant involved when the Warmaster decided to make examples of them.

At the behest of [[Malcador]], Constantine Valdor, and [[Rogal Dorn]] following the completion of the recon mission on the Vengeful Spirit, a war council was convened to take in new information and to determine the next course of action. [[Jaghatai Khan]] and Russ were already on-location, with [[Vulkan]] and [[Sanguinius]] now the newest arrivals (though the former arrived in secret, had remained in the basement ever since, and so wasn't invited). [[Rogal Dorn]] urged that all remaining forces maintain a defensive posture, but was appreciative that the [[Ultramarines]] and [[Dark Angels]] were assaulting the traitors' rear and providing relief to loyalist forces, allowing them to dictate the next few battles. Dorn declared that Terra was too confined a battlezone for the loyalist contingent of Titan Legions and so proposed a muster at '''Beta-Garmon''' and make a stand there in order to give time for [[Roboute Guilliman]] and [[Lion El'Jonson]], to crush the traitors in a pincer movement. The Battle of Beta-Garmon would itself become the site of one of the greatest battles in the entire Horus Heresy.

However, Leman Russ would not be swayed from his original plan and chose to depart from Terra for [[Fenris]] in order to scry a weakness in the superhuman upgrades that Horus gained at Molech. Upon arriving to Fenris, through the combined efforts of Russ and his best Rune Priests, Russ would enter the world spirit of Fenris to gain the knowledge he sought, and while this was hardly a risk-free endeavor, even for a primarch, it effectively meant that Russ was able to enter into a plane of the warp directly, without exposing himself to chaos. Russ was ultimately successful, and when he re-emerged back into the materium, he had determined that he would have to take the oft-maligned "Spear of Russ" with him; it's a good thing he did too, as it turns out that it's actually probably one of the most powerful pointy sticks in existence, being a gift personally made and given by [[Emperor|Daddy]].

==The Battle==
The battle itself took place over the loyalist [[Forge World]] of '''Trisolian A-4''', which had recently been captured by traitor forces following a surrender of Mechanicum forces. However, this was a surrender brought about entirely by the machinations and sabotage of a single ambitious individual (Cawl's boss), following the sudden and somewhat suspicious death of her superior. The loyalists had actually been putting up a stiff fight, but were unwillingly prevented from continuing due to the interference of that individual. For their part, the Mechanicum forces on the forge world were by and large also exceedingly loyal to the Omnissiah and despised what the Warmaster and Kelbor Hal had done to their faction, and so had fought with a fire that even Cawl found surprising. This left an enormous reserve of seething, very well-equipped, capable warriors whom Cawl would eventually be able to free and unleash against the traitors.
[[File:Battle_of_Trisolian.jpg|280px|thumb|right|Russ really wanted Horus's wolf pelt. And honestly, who can blame him?]]
The Space Wolf fleet used the unique gravitational properties of the three stars of the Trisolian star system to approach with stealth and speed, using most of their ships as a distraction while Russ own flagship engaged the ''Vengeful Spirit'' directly, allowing him to board with thousands of marines.

Russ had already figured that the battle would result in a loss for his forces, but thankfully Cawl's considerable loyalist Mechanicum elements on the Forge World managed to overthrow the regime and revert the planet back to loyalist control, allowing it to lend a hand in the conflict. Not just some paltry offerings either. Remember, this is a FORGE WORLD, so it's up there with among the hardest of targets in the setting to hit, and probably only really second to the Necrons. It's further suggested that the forces garrisoning this forge world were particularly formidable. Some even survived well after the war, later coming to Cawl's defense, and vouching for him when the latter was suspected of being a traitor. When the loyalist Mechanicum forces came back online, they caught the traitors completely flatfootted and unleashed all kinds of hell. This also meant that the traitors were forced to split their efforts and fight on two fronts, rather than focus on the Space Wolves.

Once aboard the flagship, Russ engaged Horus directly in an extremely savage duel and incredibly, [[awesome|managed to best Horus in single combat, scoring a debilitating wound with his spear and literally (not figuratively) bringing Horus to his knees]]. In addition to being the twin to Constantine Valdor's Apollonian spear, Russ' spear had been made by The Emperor himself, and so contained some of his power, and as everyone here knows, that power is anathema to Chaos, so when the Chaos-juicing Horus was wounded by it, the effect was even more destructive than it might otherwise have been. In point of fact, this power was so pronounced that when Russ began to further run him through, Horus was shown to be visibly terrified, not by Russ, the wound, or even the very real prospect of death at the hands of his brother, but of the spear's ethereal power coursing through him, obliterating the effects of his chaos-juicing, and wrecking his [[meme|massive gains]]. Unfortunately however, Russ was then suddenly and without warning [[Plot Armor|beset by a rampaging plot device in the form of a narrative cliché]] which momentarily [[Bullshit|overcame his better judgment and stated goal]]. Thus, instead of immediately killing Horus like he should have done [that was '''precisely''' the primary mission objective remember] the wound gave Horus a brief moment of clarity, and so despite the sacrifices made of himself, his sons, and some of his closest advisors (like the death of his chief [[Rune Priest]], Kva), not to mention having heavily negatively impacted Dorn's defensive plans for the [[Siege of Terra|upcoming siege]] by leaving Terra, and that the [[Noblebright|single most powerful motivator for Russ had been that he wanted to protect his father]], now, with the Arch Traitor himself at his mercy, [[fail|Russ instead tried to plead with his brother to rejoin the Emperor's fold]]. [[Troll|Horus declined and then suckerpunched Russ]], starting a new duel. Tired from the last duel, emotionally devastated, and now caught unawares, Russ was on the backfoot; Horus was about to kill him, but was prevented from delivering the killing blow by a mob of dozens of Space Wolves who literally dogpiled him, allowing [[Bjorn]] to drag Russ from the battlefield and back to the Loyalist fleet where they began to disengage and retreat.

==Aftermath==
Already heavily depleted from all the military actions since Prospero, following Trisolian, the Space Wolves were mauled further still, with some companies even being reduced to just a fifth of their strength, and ultimately dropping the effective fighting force of the legion as a whole down to somewhere in the range of just 10 to 15 thousand marines, after having started the battle with around 40,000. While on its face that number of survivors may still sound a tad higher than expected, consider that A, this is all that they had to get them through the rest of the war and the subsequent [[Great_Scouring|Scouring]], and B, they would eventually form an [[Wolf Brothers|ill-fated Second Founding chapter]], also made largely of veterans of the Heresy. Or to put it another way, that means that the Space Wolves [[Grimdark|suffered something like 66% casualties to their entire legion in a single engagement]]. Under most circumstances, those are literally (not figuratively) ''war-ending'' casualty figures, so don't for a second think that they got off lightly. They most certainly did not. In any case, without any means of quickly replenishing their forces, this effectively ended the existence of the VIth Legion as a legion.

For his part, Horus was [[butthurt|NOT happy]] in the battle's aftermath. Far from gloating, he was sour over the considerable losses his own forces had incurred, but more than that, he was rattled that [[Not as Planned|Russ had bested him]]. Horus hadn't considered Russ his equal even before he fell to Chaos, yet now, even being infused with additional power from the Ruinous Powers, Russ had laid him low and legitimately could have killed him, had <s>the plot not suddenly intervened</s> Russ' feelings not gotten the better of him. Horus spent time ruminating on this, fully acknowledging it to himself and taking it all in, because he clearly did not like the implications of this. It was amidst these meditations that Horus then suddenly began to experience moments of visions, or perhaps glimpses of visions of his conscience, or something to that effect, berating him for betraying his father, becoming a pawn of the Ruinous Powers, and ultimately just doing what he knew to be wrong. It was this last that most unsettled Horus as it had never happened before, and try as he might, he couldn't simply dismiss it; unbeknownst to him at the time, the wound Russ had dealt him had impacted his spirit as much as his body, and the power of the Emperor's light had slowly started to counteract the baleful malaise of the chaos gods. Flustered and annoyed, he then ordered a [[Abaddon|certain armless failure]] to lead a contingent of his forces to hunt down the remnants of the VIth and not return without Russ' head. [[Fail|Disappointmaddon then returned without Russ' head]]. Oh, and without most of the astartes Horus had given him as well. Abaddon basically starting as he meant to go on.

With their Primarch unconscious from his injuries, the remaining Space Wolf commanders have to make a decision of whether to stay together and likely die, or disperse and play no further part in the Horus Heresy. Choosing to remain together to present a viable threat that the traitors would have to divert resources to deal with, they retreat to '''Yarant III''' to make a stand where they are hunted by [[Abaddon|Failbaddon]] but are eventually saved by [[Corax]] following his own gene-seed debacle.

Horus was partially cleansed of the corruption he gained at Molech after being wounded by the Spear of Russ and a momentary glimpse of the original Primarch is witnessed by his brother, granting him enough self control to reject the Chaos Gods but continued the campaign on his own terms. [[Lorgar]] believed that Horus' failure to submit to the gods' will but still accepting their gifts would lead them to withdraw their power [[Siege of Terra|when he needed it most]] and cause the war to be lost. Horus later fell into a coma at the aforementioned battle at Beta-Garmon as his wound reopened, and Lorgar attempted a coup.

A shard of Horus' soul that had been purified by the Spear of Russ would be fought over by the [[Chaos Gods]], requiring the sacrifice of Maloghurst in order to free him and Lorgar was expelled from the Warmaster's fleet after his coup failed, with Horus warning that he would kill Lorgar if he ever saw him again.

{{40k-Timeline}}
[[Category:Warhammer 40,000 Battles]]

First Founding

2022-04-24T12:39:43Z

2603:8001:6901:2586:B96C:8554:D60C:74FE: /* Legions in 40k */

{{Topquote|They shall be my finest warriors, these men who give of themselves to me. Like clay I shall mould them, and in the furnace of war forge them. They will be of iron will and steely muscle. In great armour shall I clad them and with the mightiest guns will they be armed. They will be untouched by plague or disease, no sickness will blight them. They will have tactics, strategies and machines so that no foe can best them in battle. They are my bulwark against the Terror. They are the Defenders of Humanity. They are my Space Marines and they shall know no fear.|The [[God-Emperor of Mankind|Emperor of Mankind]] on the creation of the Adeptus Astartes}}

{{Topquote|Vos, Hæmi gelidæ valles, quas sæpe cruentis Stragibus æquavit Stilicho ; vos, Thracia, testor, Fulmina, quæ largo mutastis sanguine fluctus ; Dicite, Bisaltæ, vel qui Pangæa juvencis Scinditis, offense quantæ sub vomere putres Dissiliant glebis galæ, vel qualia rastris Ossa peremtorum resonant immania regum.
Valley of (Mt.) Hemus, which so often Stilicho buried with corpses! Rivers of Thrace, who saw blood replace your waters! I take you as witnesses. Answer, ye Bisaltians, and ye folks whose chariots labour the guts of Pangae! So many helmets covered in rust, broken into shards by the strokes of the ploughshare, a great many times the mattock ploughed the gigantic bones of fallen Kings who found death within your countryside.|Claudius Claudianus, ''In Praise of Stilicho'', first volume}}

After he conquered [[Terra]], the [[God-Emperor of Mankind|Emperor of Mankind]] set out on a [[Great Crusade]] to re-unite the lost human colonies into a mighty [[Imperium]]. He soon realized that bog-standard humans wouldn't be enough; some situations called for a small number of devastatingly powerful warriors, a surgical strike force to smash enemy linchpins. To fill this role, he created his [[Primarchs]], and from their genes, he created the '''Legiones Astartes''', the twenty [[Space Marines|Space Marine]] Legions, in an event [[Second Founding|retroactively]] named the '''First Founding'''.

==The Legions==

{|align=center border="1" cellpadding="5" cellspacing="0" style="text-align:center;"
|-
! Legion Number !! Primarch !! Homeworld !! Legion Name !! Allegiance
|-
! I
|[[Lion El'Jonson]] || [[Caliban]] || [[Dark Angels]]
| style="background-color: navy;color:white;"| ABSOLUTELY LOYAL, AND HAVE TOTALLY NEVER BEEN TRAITORS AT ANY POINT. PLEASE FOLLOW ME DOWN THIS ENTIRELY SAFE AND UNSUSPICIOUS DARK ALLEY SO THAT I MAY EDUCATE YOU ON THE TOTALLY CLEAN AND LOYALIST HISTORY OF THE DARK ANGELS!
|-
! II
! colspan="5" | +++Records expunged+++
|-
!III
| [[Fulgrim]] || [[Chemos]] || [[Emperor's Children]]
| style="background-color: maroon;color:white;"| Absolutely FABULOUS traitor
|-
! IV
| [[Perturabo]] || [[Olympia]] || [[Iron Warriors]]
| style="background-color: maroon;color:white;"| Super grumpy Traitor
|-
!V
| [[Jaghatai Khan]] || [[Chogoris|Chogoris/Mundus Planus]] || [[White Scars]]
| style="background-color: navy;color:white;"| Speedy, laughing Loyal
|-
!VI
|[[Leman Russ]] || [[Fenris]] || [[Space Wolves]]
| style="background-color: navy;color:white;"| Who's a Loyal Boy? Is it you? Is it you? ruff ruff yiff
|-
!VII
|[[Rogal Dorn]] || [[Terra]], [[Inwit]] || [[Imperial Fists]]
| style="background-color: navy;color:white;"| MEGA <s>ULTRA</s> FISTISHLY Loyal
|-
!VIII
|[[Konrad Curze]] || [[Nostramo]] || [[Night Lords]]
| style="background-color: maroon;color:white;"| Spooky traitor (dead)
|-
!IX
|[[Sanguinius]] || [[Baal]] || [[Blood Angels]]
| style="background-color: navy;color:white;"| Loyal and fabulously DEEAADD!!!
|-
!X
|[[Ferrus Manus]] || [[Medusa]] || [[Iron Hands]]
| style="background-color: navy;color:white;"| Loyal (also DEAD)
|-
!XI
! colspan="5" | +++Records expunged+++
|-
!XII
|[[Angron]] || <s>[[Nuceria]]</s> [[Bodt]] || [[World Eaters]]
| style="background-color: maroon;color:white;"| RAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGE!!!! (traitor)
|-
!XIII
|[[Roboute Guilliman]] || [[Macragge]] || [[Ultramarines]]
| style="background-color: navy;color:white;"| SUPER DUPER Loyal. DEFINITELY never made another Imperium. Nope. Never. No chance.
|-
!XIV
|[[Mortarion]] || [[Barbarus]] || [[Death Guard]]
| style="background-color: maroon;color:white;"| Icky traitor
|-
!XV
|[[Magnus the Red]] || [[Prospero]] || [[Thousand Sons]]
| style="background-color: maroon;color:white;"| <s>Did Nothing Wrong</s> Traitors (Because of those fuckwit Space Wolves and Horus. Also Fucking Tzeentch)
|-
!XVI
|[[Horus|Horus Lupercal]] || [[Cthonia]] || [[Black Legion|Luna Wolves/Sons of Horus]]
| style="background-color: maroon;color:white;"| UBER Traitor (and also UBER dead)
|-
!XVII
|[[Lorgar|Lorgar Aurelian]] || [[Colchis]] || [[Word Bearers]]
| style="background-color: maroon;color:white;"| The first Traitors
|-
!XVIII
|[[Vulkan]] || [[Nocturne]] || [[Salamanders]]
| style="background-color: navy;color:white;"| Loyal (and with a slightly weird fire fetish)
|-
!XIX
|[[Corvus Corax]] || [[Deliverance]] || [[Raven Guard]]
| style="background-color: navy;color:white;"| Sneaky beaky loyal
|-
!XX
|[[Alpharius]] [[Omegon]] || Unknown || |[[Alpha Legion]]
| style="background-color: maroon;color:white;"| It's complicated; even they might not know at this point, but according to the Imperium at large, Traitor. Rogal slew Omegon, but Alpharius is (probably) still at large or is it the other way around... One of them is probably dead anyways.
|}

==Organization==
[[File:Space Marine Legion.jpg|400px|thumbnail|right|]]
The Legiones Astartes, being far larger than current Space Marine Chapters, were organized along drastically different lines. At the head of the Legion was its [[Primarch]] Commander who oversaw the Legion's headquarters. Prior to reuniting with their Primarch, this position was filled by the Legion Master, the most senior Space Marine in the Legion. Below this were the '''[[Space Marine Chapter|Chapters]]''' of the Legion, each of which was commanded by a [[Chapter Master|Lord Commander]]. Each [[Space Marine Chapter|Chapter]] in turn was divided into a number of '''Battalions''' led by a '''Lieutenant Commander'''. Each battalion was then further divided into '''Companies''' led by a [[Brother-Captain|Captain]]. The Company, itself divided into a number of '''Squads''', was the basic military division of the Legiones Astartes. Due to the varying sizes of each Legion and the varying nature of supply and attrition, there was no fixed number of how many Chapters, Battalions, Companies, and Squads a Legion would contain. But even then, there was no fixed [[Codex Astartes|institution]] that a particular Company should be composed of certain units, with each Company specialising naturally as marines and officers became veterans of a certain form of warfare.

===Number of Legionaries===
The Legions were massive armies, and the size of each could vary tremendously. A precise number was never truly achieved and maintained. Even during the Great Crusade, some Legions were very numerous, while others were not. The numbers would always vary with new recruits and inevitable battle-losses, and also important was the availability of potential recruits and the [[Roboute Guilliman|administrative]] [[Perturabo|skills]] of the Primarch and his officers.

However the closest thing to a 'standard' legion is what the Emperor started with which was 10 chapters to a legion, 2 battalions to a chapter, five companies to a battalion and 100 marines to a company. Theoretical nominal strength: 10,000.

The most numerous Legion of all was the [[Ultramarines]]. The [[Thousand Sons]] of [[Magnus]] were of a small number as many of them had developed mutations or uncontrollable levels of psychic powers. [[Fulgrim]]'s samples had been largely lost, and this left the Legion of the [[Emperor's Children]] also with a very small number. Both of these Legions would increase their numbers to acceptable standards only after their Primarchs were found. The [[Dark Angels]], being the First Legion, were originally the largest one but their numbers declined significantly during the [[Rangdan Xenocides]]. The Iron Warriors were also quite numerous for a while, but Perturabo's [[Death Korps of Krieg|unique view on what qualified as acceptable losses]] changes that in time.

The approximate sizes of a few of the Legions at the start of the Heresy have been given in various sources (it should be noted that originally these numbers were much smaller, a full zero knocked off until they were upped by the BL/Forgeworld writers):

*[[Dark Angels]] - 200,000 or just above, though it is uncertain whether this includes Luther's contingents of the Fallen. Recent Horus Heresy era fluff would seem to suggest that it does not.
*[[Emperor's Children]] - 120,000
*[[Iron Warriors]] - 150,000 to 180,000 but could have been more, if not for them regularly taking horrific casualties. The estimate is from after the notably costly series of wars that preceded their betrayal, suggesting higher numbers in the past.
*[[White Scars]] - 95,000
*[[Space Wolves]] - 95,000 to 100,000 (originally 130,000).
*[[Imperial Fists]] - 130,000
*[[Night Lords]] - Officially 90,000 to 120,000 but actually close to the larger Legions.
*[[Blood Angels]] - 150,000 divided in 300 companies 500 strong. Does not include the small caretaker force of a few additional companies constantly maintained on Baal.
*[[Iron Hands]] - In excess of 113,000
*[[World Eaters]] - 150,000
*[[Ultramarines]] - 320,000+ - In-Universe speculation starts at around 250,000, ranging up to 400,000 at the most, the truth likely landing somewhere in the middle. Massive influx hinted to have been from absorbing the remains of the [[lost legions]].
*[[Death Guard]] - 95,000 (Mortarion wanted a much larger Legion but never came close to attaining it).
*[[Thousand Sons]] - Originally around or under 10,000, retconned to have 80,000 to 85,000.
*[[Sons of Horus]] - 130,000 to 170,000
*[[Word Bearers]] - 140,000 to 250,000+
*[[Salamanders]] - 89,000
*[[Raven Guard]] - 80,000
*[[Alpha Legion]] - In-universe speculation is 90,000 to 120,000, with 180,000 probably being the greatest probable size. No-one knows for sure.

Using the lowest and highest numbers this means there were 1,933,095 to 2,358,000 Space Marines without including the White Scars. These estimations are the Legions at the closing of the Great Crusade, though it would be a mistake to assume that the number was final and only went down during the Horus Heresy. In fact, many of the Legions were still recruiting at an accelerated rate and the number actually went up, [https://1d4chan.org/wiki/Raven_Guard#The_Last_Ones_Standing|though at some cost however]. To put some context to that number, on the low end that's about the size of the American forces in the Korean War, and on the high end that's about all the Soviets that were involved in the Battle of Berlin.

It's also a mistake to assume that the Traitor Legions went turncoat completely en-masse, when in fact the [[Traitor Legion Loyalists|Loyalist elements of those Legions]] counted for a significant portion of their strength. Approximately 100,000 loyalist Legionaries were purged at Isstvan III, practically counting for a Legion-sized force to themselves. Their destruction came at a much greater cost to the Traitor Legions mustered there, cutting the traitor forces down by half, probably more, and so Horus would enter the war with his strength greatly reduced, but could count on daemon auxiliaries for reinforcements. While rare, there were also a few members of loyalist Legions who sided with the traitors as well - the Dark Angels and White Scars in particular were very nearly torn apart by the resulting infighting. The White Scars only reunited after Jaghatai Khan revealed what he had learned and made the Horus supporters surrender, after which some of the worst offenders were executed and the rest were placed in the most dangerous warzones to redeem themselves. The Dark Angels actually split more dramatically, though their detractors were more inward-looking and can't be seen as aligned with Horus. See their own article for more details.

===Assets===
Besides having far greater numbers of Astartes to draw on, the legions were also better equipped and had a much wider variety of arms and vehicles to choose from. Many armored vehicles that are currently Imperial Guard specific once served in the legions, such as the [[Basilisk Artillery Gun|Basilisk]], while other wargear like [[Volkite]] guns or [[Mastodon]]s were mothballed due to their rarity or their obsolescence for the smaller-sized chapters. Numerous tactical roles were likewise phased out, for better or worse, though some roles did find successors in contemporary Chapters both Astartes and [[Primaris Marine|Primaris]].

'''Heresy-Era Specialties:'''
*[[Breacher Siege Squad]]
*Despoiler Squad
*[[Destroyer Squad]]
*[[Moritat]]
*[[Reconnaissance Squad]], succeeded by [[Scout Squad|Scouts]] and [[Eliminator]]s.
*Seeker Squad
*Sky Hunter Squad
*Tactical Support Squad
*[[Legion Consul]]

== Horus Heresy ==

{{Main|Horus Heresy}}

For all their power, the [[Space Marines]] and [[Primarchs]] were not perfect; ([[Alpharius|may]][[Omegon|be]]) half of them were sufficiently flawed to be tempted by (or driven to) [[Chaos]], led by Warmaster [[Horus]]. The traitors were defeated, but at a terrible cost, including the near-death of the [[God-Emperor of Mankind]] and trillions of deaths of invaluable astartes and human beans.

[[Roboute Guilliman]] decided that the so-called [[Horus Heresy]] was proof that one man could not be trusted with power over one-twentieth of the Imperial Armed Forces, so he enacted several reforms to divide the Imperial Army into the Imperial Guard and Navy, and split the remaining loyalist Legions into Chapters, in accordance with his [[Codex Astartes]]. This event was later known as the [[Second Founding]].

==Legions in 40k==
Technically all of the Chaos Marines are still 'legions', at least in name. They never split into chapters so legions they technically remain. However, since they are all split up into roving warbands and there is no central control ([[Black Legion|with a]] [[Death Guard|few]] [[Thousand Sons|exceptions]]) it's hard to say they really count anymore. Perhaps most importantly it's impossible to guess how many dudes there are even technically in any legions pool. When they aren't fighting the Imperium, they are fighting each other, and since none of the Black Crusades have been successful we can reasonably assume that marines aren't pouring out of the Eye of Terror in their hundreds of thousands. It's utterly impossible to guess how many dudes they got. They obviously have enough to attack the Imperium with (especially since their recruiting practices aren't as picky as their Loyalist counterparts), but probably not much more than the Loyalist Space Marines. Probably more than they came to the Eye with though, between further recruiting (from the Eye of Terror human population and anyone they can abduct/brainwash) and former Loyalists turning to Chaos.

As for the Loyalists... Since the introduction of the [[Codex Astartes]], there are obviously no longer any Space Marine legions though that does not stop certain chapters from being described or implied to be at ''"Legion Strength"''. Though this is often a common [[Neckbeard]] error and sometimes even gets used in the fluff, where the term is mistakenly used to describe any significantly oversized chapter, though even then they never compare to the forces from the Great Crusade. Though some make a good attempt at it:

*[[Imperial Fists]] - As it turned out, Dorn didn't fully break up his Legion. Every Son of Dorn chapter has a secret plan dubbed "The Last Wall"- if the main Chapter were to encounter an immediate threat to Terra, it could call its successor chapters to unite them into a full Legion until the threat is dealt with; the prospect of so many chapters working in such close cooperation was something that frightened the [[High Lords of Terra]] and they did not approve. Nonetheless, this plan not only saved Terra from [[The War of The Beast|the largest Ork WAAAGH!! the Imperium has ever dealt with]], but also rescued the Imperial Fists from ''actual'' extinction in the process.
*[[Black Templars]] are obviously over-strength in multiples of 1000 and keep to the spirit of the Great Crusade unlike any other chapter. This force is made up of three primary crusade fleets of unknown size which can end up spread over up to thirty engagements, where the size of a force could be as large as [[Dawn of War|"nearly" chapter strength]] ''(but not '''over''' for obvious reasons)'' or as small as a [[Dawn of War 2|single ship and a handful of squads]], so can be averaged at around chapter strength for each primary fleet. This arrangement is meant to be fluid, and changes all the time as fleets merge and disperse. Respectable figures put their numbers between 2000-6000. The Templars are able to get away with this due to an obscure exception in the Codex allowing chapters to be over-strength during major Crusades in order to easily replace losses, and the Templars are ''always'' crusading. This is unofficially tolerated by the High Lords because of fanatical loyalty, constant casualties, consistent results and the fact that the Templars are so spread out. They may be legion sized 'total' but they're not Legion sized at any single location.
*[[Space Wolves]] make no secret of the fact they ignore the Codex Astartes, but even then they are no-where near their original size. In M32 during the '''Battle of the Fang''' it is remarked that most of ''The Aett'' is actually abandoned. Furthermore, Logan Grimnar's own Great Company numbers 200 marines prior to the Sanctus Reach campaign and is the largest company on its own ''(i.e.: not including the chapter assets)''. Their current number was originally between 1200-3000, but following the Siege of Fenris it is almost certainly smaller. Though the influx of Primaris Marines they received shortly afterwards likely also replenished their losses, and perhaps even surpassed their original numbers. Vikings aren't exactly renowned as avid number-keepers at the best of times though, so who the hell knows.
*[[Astral Claws]] were ''actually'' accused of Legion building and declared heretics even when they were not yet followers of [[Chaos]], their number at the time of the Badab War was around 3000, though they never even used that number as a single force and spread themselves throughout their '''[[Warhammer_40,000/6th_Edition_Tactics/Tyrant%27s_Legion|PDF forces]]'''
*[[Dark Angels#The Unforgiven|The Unforgiven]] are most likely one of the closest examples of a true Legion in that each of the successor chapters arrange themselves under one ''secret'' command structure (the '''Inner Circle'''). Though they each [[RAW|obey the letter, if not the spirit]] of the [[Codex Astartes]] and maintain mostly standard chapters of ten companies. The combined numbers of Dark Angel's successors would put them at around ''150,000 marines'', and this is just a rough estimate, though we don't know if all of the Dark Angel's successors actually consider themselves part of the Unforgiven. Some definitely do though. Oh yes indeed. The Inner Circle has been known to send a random successor chapter across the galaxy to do the space marine equivalent of getting them a six pack (of traitors) when the main chapter is too busy.
*[[Ultramarines]] - The 23 [[Second Founding]] chapters of the Ultramarines are all represented in the senate of [[Ultramar]] and some of them would cooperate on matters of Codex orthodoxy to ensure that there were no deviations. The [[Genesis Chapter]] in particular routinely loaned squads and officers to the Ultramarines to fill in gaps, while other successors could loan squads to the [[Ultramarines Honour Company]] and get to wear the blue uniform. Because the Ultramarines account for nearly half of the later-founded chapters in the Imperium, they would amount to around ''500,000 marines'' and nominally look to their progenitor for the source of their leadership and guidance, with instances of Marneus Calgar stepping in to settle disputes between chapters not even of his bloodline or issuing decrees against [[Minotaurs|chapters]] in matters that have nothing to do with the Ultramarines directly. With the return of [[Roboute Guilliman]] and his re-organisation of both the Codex and the region of Ultramar; even though chapters officially maintain their sovereignty apart from each other, he has formally created a cross-Chapter command structure of Tetrarchs to coordinate and protect the Five-Hundred Worlds.

All of the original legions maintain ties with with their subsequent founding chapters (except for the Salamanders, who don't have any confirmed successors, and ignore the unconfirmed ones), though the level of formality is different from Chapter to Chapter. The Blood Angels occasionally call all their bros together and go to war, even going to far as to demand they provide the Blood Angels with new squads so that they could rebuild their weakened chapter.

The Imperial Fists successors did the same thing during the war of the Beast; donning Imperial Fist colours to ensure that the Chapter would not go extinct but even in those cases, [[Gabriel Seth]] had to remind [[Dante]] that he had no authority to actually demand troops from his successors and might get further by asking nicely.The new Imperial Fists considered changing their colours controversial and a little bit blasphemous, with the [[High Lords of Terra]] generally protesting about Space Marines working in such close cooperation at all.

While musing with Aeonid Thiel, Guilliman's original dream for the Codex was not to simply split up the Legions at all, but to create a single unified Legion formed of self-sufficient chapters that would come together or break apart as necessary, irrespective of their individual bloodlines, while making it harder for a taint in one chapter to effect the whole.

Given the number of times multiple chapters from different legions have gotten together for a big crusade, he arguable succeed in this goal. Much of what goes on with the Ultramarines tended to be done out of starry-eyed respect and deference towards them rather than grudging support, so in this case, their high level of cooperation appears to be following the spirit of Guilliman's original idea quite well.

Obviously, the High Lords would prefer to think otherwise because they were scared to death of the possibility of a second Space Marine unification and uprising, even going so far as to plotting to overthrow the resurrected Lord Guilliman before he took control over the Senatorum (which instantly backfired when the Custodians got whiff of it in about ten minutes, also you know, '''PRIMARCH''').

==Two Unknown Legions==

In the [[Rogue Trader|First Edition]] of [[Warhammer 40,000]], the twenty First Founding Chapters were all known. It seems that [[Games Workshop]] had more love for some than others; when they made [[fluff]] revisions in the transition to Second Edition, the [[Valedictors]] and [[Rainbow Warriors]] were demoted to one of the "Later Foundings."

Nowadays, <s>nothing</s> [[Horus_Heresy|little]] concrete is known about the Legions II and XI, and likewise their [[Primarch#Two Missing Primarchs|unknown Primarchs]]. Officially, the Imperium deleted all records regarding the "Lost Legions"; the only reminder of the two legions were empty plinths in the Hegemon where statues of the Primarchs stood at the Imperial Palace. Throughout the ''[[Horus Heresy]]'' series, it is suggested that the [[Space Wolves]] destroyed them for some reason. [[The Horus Heresy: Massacre]] includes a timeline of the events at the end of the [[Great Crusade]], and in 965 and 969.M30, the Space Wolves engaged in two missions from which all data was redacted. In the book ''The First Heretic'', when a daemon takes the [[Word Bearers]] on a trip back in time to show them the creation of the Primarchs, the Word Bearers dialogue indicates that the XI Legion in particular did something bad enough for the Emperor to lead their purge himself.

In the book ''Fear To Tread'', Sanguinius tells Horus that he hasn't revealed the existence of the Red Thirst to the Emperor because he fears that the Blood Angels would be purged as well, indicating that gene-seed flaws may have also been a factor. ''Deliverance Lost'' has a dialogue between taking place during Corax's first meeting with the Emperor where he asks why only sixteen of his brothers were waiting to meet him if he was the nineteenth Primarch to be found, only for the Emperor to deflect the question; consequently, we can assume that the Legions were purged sometime before Corax's discovery (and were never around for the Horus Heresy), during [[Rangdan Xenocides]]. He also forced the remaining Primarchs to swear an oath never to speak of their absent brothers, so whatever they did must have been extraordinarily bad.

In ''Legion,'' a ship's captain notes that the naughtiness of the [[Alpha Legion]] isn't the first time that a Legion has "overstepped it's mark" and that the Imperial Army fleet should report the Alpha Legion "before they become too powerful," which might imply that one of the Legions got away with naughtiness for a long time and then used their entire Legion to fight the Emperor. 'Horus Heresy Book 3: Extermination also hints at the fate of the two missing Legions, first hinting that one Legion did not pass the "Alpha" intake (to take them up to Legion-Strength) when going through testing and the other saying that "the disaster of [REDACTED] had proven the folly of attempting to recruit Legiones Astartes stock from potentially tainted sources." These could be in reference to the same Legion (using tainted stock in the Alpha intake) or two separate ones, with Legion A fucking up in the Alpha intake and Legion B using tainted stock in the later Great Crusade.

In ''Fabius Bile: Clonelord'', it is stated that "one of the two" missing Legions lead an expedition to the Ymga monolith, an artefact associated with the [[Necron]]s.

Since Horus and the other traitor Primarchs managed to keep their records un-expunged during the Horus Heresy (and afterwards, since the Space Wolves clearly know who Magnus is, the Grey Knights clearly know who Mortarion is, and Horus' name seems to have [[Lulz|become a swearword]] while Guardsmen are obviously aware that traitor Marines exist and officers also know traitor Primarchs exist too), it can be assumed the missing Legions' naughtiness was something even worse. [[Heresy|Possibly they refused to wear pauldrons]], [[Alpha Legion|we don't know]]. In The Palatine Phoenix, shortly before his Legion's first solo mission, [[Fulgrim]] notes that "even the normally contemplative master of the Second had broken his silence to accuse Fulgrim of hubris", so at least one of the missing Primarchs had spent some time around their brothers, and was active during the Great Crusade. In The Chamber at the End of Memory, Dorn said that very few among his brothers interacted with the II and the XI Primarch, and he was one of them. Millennia later during the [[Ultima Founding]], [[Cawl | Belisarius Cawl]] proposes using gene-seed from the II and XI legions to make Primaris marines, so there is either surviving genetic stock from the two Legions, or possibly actual legionaries that Cawl had been experimenting on for the last ten thousand years.

''The Chamber at the End of Memory'' revealed that not only the entire Imperium were forbidden to speak of the II and XI following their fall (which according to Malcador and Rogal Dorn was terrible enough to overshadow the '''''entire Horus Heresy up to the Siege of Terra''''') but those who had interacted with them were made to undergone mind-cleansing (or memory adjustment in the case of the Primarchs) so as to wipe out knowledge of the incidents. More interesting however was that Dorn and Gulliman came up with that idea to spare the Astartes from said two legions from death, and they allowed Macaldor to mind-wipe them all. There was a very good chance that these Astartes ended up with the Fists and the Ultramarines (as the theory above described).

<s>Or there may simply be no missing Legions. According to a source who allegedly worked for Games Workshop for five years (seen [http://warhammer40000roguetrader.blogspot.com/2012/06/art-of-rogue-trader.html?showComment=1343572598289#c3841833106793028129 here]), Rick Priestley (who helped write the first Rogue Trader) read about the Roman notion of Damnatio Memoriae, and simply threw in the idea of two "missing" Space Marine Legions as a "nod" to Imperial Rome (specifically, the three Roman legions whose numbers ([[Word Bearers|XVII]], [[Salamanders|XVIII]] and [[Raven Guard|XIX]]) were never used after they were wiped out in the disastrous [[Wikipedia: Battle of the Teutoburg Forest| Battle of the Teutoburg Forest]]. So, nothing significant can ever be revealed about them, because they never really existed in the first place. Additionally, incorrectly numbering your military units to fool the enemy into thinking you have more has real life precedent. SEAL Team 6 was given its name to convince the Soviets the US had 6 SEAL teams, even though they only had 3 units at the time. In theory if the Emperor just made 18 legions, skipping numbers 2 and 11 could make an enemy think that the Imperium had two more legions than they really did, and the galaxy is large enough to make that deception work.</s> The Lost Legions actually did exist however, even if they started as a joke. The real reason that they were kept around between Rogue Trader and recent revelations was so that people could [[Your Dudes|make up their own pair of Primarchs for model painting and personal fanon]] (although this has lost its effect as doing so is synonymous with making them Mary Sues, and roughly 90% of all fan Lost Legions are this. The other common trait is to make the legion almost entirely composed of pathetic losers, the remaining 10%).

Although one possible name for at least one of the legions is the [[Stormcast Eternals]].

==See Also==
* [[Warhammer_40,000/Tactics/Space_Marine_Legion_List_(30k)|30k Legion Tactics]]
* [[Legion Consul]]

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