View source for Known Great Crusade Chapters of the Ultramarines

{{UltramarinesPortal}}
By the late [[Great Crusade]], the [[Ultramarines]] [[Space Marine Legion|Legion]] was organised into 25 [[Chapter]]s,{{Fn|1a}}{{Fn|1k}} each organised into multiple [[Battalion]]s and [[Space Marine Company|Companies]], and made up of roughly 10,000 [[Space Marines]].{{Fn|1j}}{{Fn|2}}

== Known chapters ==
By the time of the [[Calth Muster]], the [[Ultramarines]] included:
*[[1st Chapter (Ultramarines Legion)|1st Chapter]]: noted for their effective deployment of [[Super Heavy Tank|superheavy tanks]] during the [[Battle of Calth]]{{Fn|1f}}
*[[2nd Chapter (Ultramarines Legion)|2nd Chapter]]{{Fn|1f}}
*[[3rd Chapter (Ultramarines Legion)|3rd Chapter]]{{Fn|1f}}
*[[4th Chapter (Ultramarines Legion)|4th Chapter]] ("''the Aurorans''"): known for their use of armoured formations;{{Fn|1p}}{{Fn|1h}} formed the [[Aurora Chapter]] in the [[Second Founding]]{{Fn|3}}
*[[5th Chapter (Ultramarines Legion)|5th Chapter]]{{Fn|1p}}
*[[6th Chapter (Ultramarines Legion)|6th Chapter]]{{Fn|1p}}
*[[7th Chapter (Ultramarines Legion)|7th Chapter]]: deployed in the far reaches of the [[Dominion of Storms]] aboard the ''[[Thunder of Hera]]'' by the [[Battle of Calth]], and thus "unmarked"{{Fn|1g}}{{Fn|Note 1}}
*[[8th Chapter (Ultramarines Legion)|8th Chapter]]: only at a strength of 6,000 Marines before Calth;{{Fn|1p}} further reduced to less than 1,000 warriors during the [[Battle of Calth]]{{Fn|1b}}
*[[9th Chapter (Ultramarines Legion)|9th Chapter]]: led by [[Chapter Master]] [[Klord Empion]] and assigned the [[Battle Barge|battlebarge]] ''[[Phaunos]]''; completely destroyed during the [[Battle of Calth]]{{Fn|1d}}{{Fn|1f}}{{Fn|1l}}
*[[10th Chapter (Ultramarines Legion)|10th Chapter]]: fighting in the far [[Eastern Fringe]] by the [[Battle of Calth]] and thus "unmarked"{{Fn|1g}}{{Fn|Note 1}}
*[[11th Chapter (Ultramarines Legion)|11th Chapter]]{{Fn|1c}}
*[[12th Chapter (Ultramarines Legion)|12th Chapter]]{{Fn|1c}}
*[[13th Chapter (Ultramarines Legion)|13th Chapter]]{{Fn|1m}}
*[[14th Chapter (Ultramarines Legion)|14th Chapter]]:{{Fn|1a}} only at a strength of 6,000 Marines before Calth{{Fn|1p}}
*[[15th Chapter (Ultramarines Legion)|15th Chapter]]: only at a strength of 6,000 Marines before Calth;{{Fn|1p}} further reduced to less than 1,000 warriors during the [[Battle of Calth]]{{Fn|1b}}
*[[16th Chapter (Ultramarines Legion)|16th Chapter]]{{Fn|1n}}
*[[17th Chapter (Ultramarines Legion)|17th Chapter]]:{{Fn|1i}} known for their use of armoured formations{{Fn|1p}}
*[[18th Chapter (Ultramarines Legion)|18th Chapter]]:{{Fn|1i}} known for their use of armoured formations{{Fn|1p}}
*[[19th Chapter (Ultramarines Legion)|19th Chapter]]: [[Evocati]]i{{Fn|Note 2}} formation; not present at the Battle of Calth and thus "unmarked"{{Fn|1g}}
*[[20th Chapter (Ultramarines Legion)|20th Chapter]] ("''The Eagles''"): specialized for void combat{{Fn|1p}}
*[[21st Chapter (Ultramarines Legion)|21st Chapter]] ("''The Hawks''"): best known for its skilled pilots{{Fn|1p}}
*[[22nd Chapter (Ultramarines Legion)|22nd Chapter]] (the "''[[Nemesis]]''"): known for containing most of the [[Space Marine Legion|Legion]]'s [[Destroyer Marine]]s, i.e. the [[Nemesis Destroyers]]{{Fn|1e}}.  Contained at least two full companies of Destroyers, the 2nd and the 4th{{Fn|4}}.
*[[23rd Chapter (Ultramarines Legion)|23rd Chapter]]: known for their use of armoured formations{{Fn|1p}}
*[[24th Chapter (Ultramarines Legion)|24th Chapter]] ("''The Exitium''"): [[Evocati]]i{{Fn|Note 2}} formation; known for their use as a strategic reserve force, and large amount of support equipment; garrisoning and training in [[Ultramar]] by the [[Battle of Calth]], thus "unmarked";{{Fn|1g}}{{Fn|Note 1}} however, a small contingent was present at Calth{{Fn|1o}}
*[[25th Chapter (Ultramarines Legion)|25th Chapter]]: [[Evocati]]i{{Fn|Note 2}} formation; garrisoning and training in [[Ultramar]] by the [[Battle of Calth]], thus "unmarked"{{Fn|1g}}{{Fn|Note 1}}

==Notes==
*{{Endn|Note 1}}: "unmarked": The [[Ultramarines]] who served in the [[Battle of Calth]] received, both physically as well as psychologically, the [[Mark of Calth]]. They were changed, and from then, differed from their brothers who had not been present. The latter were thus called the "unmarked", and were never again able to fully fit in with the rest of the [[Space Marine Legion|Legion]] that had endured the horrors of Calth. Even [[Roboute Guilliman]] appeared uncomfortable in their presence, as they reminded him of what his legion had lost at Calth. In the [[Great Scouring]], the "unmarked" chapters were increasingly deployed away from the remaining legion, and they were among the first to be split off and organised into independent Space Marine [[Chapter]]s during the [[Second Founding]].{{Fn|1g}}
*{{Endn|Note 2}}: "Evocatii": indicates that the [[Chapter]] had a large proportion of raw recruits, supported by a core of veterans. Used by [[Roboute Guilliman]] as training units for [[Neophyte]]s.{{Fn|1j}}
*Note 3: Some Companies are not clearly tied to a Chapter by number.  For example, the "547th Company" is noted as being on Calth and surviving, but the number of the company doesn't line up with an existing Chapter.{{Fn|4}}
*Note 4: In the 41st Millennium, the [[Black Consuls]] claim that their first Chapter Master [[Arrias Cordos]] was part of the "72nd Chapter" during the Horus Heresy. No Heresy-era reference to the 72nd Chapter exists, and its possible that they were originally the "72nd Company" before time corrupted the remembering.{{Fn|5}}

==Sources==
*1: [[The Horus Heresy Book Five - Tempest]]:
**{{Endn|1a}}: pgs. 32-34
**{{Endn|1b}}: pg. 52
**{{Endn|1c}}: pg. 51
**{{Endn|1d}}: pg. 50
**{{Endn|1e}}: pg. 41
**{{Endn|1f}}: pg. 38
**{{Endn|1g}}: pg. 33
**{{Endn|1h}}: pg. 55
**{{Endn|1i}}: pg. 61
**{{Endn|1j}}: pg. 80
**{{Endn|1k}}: pg. 82
**{{Endn|1l}}: pg. 89
**{{Endn|1m}}: pg. 92
**{{Endn|1n}}: pg. 103
**{{Endn|1o}}: pg. 60
**{{Endn|1p}}: pg. 39
*{{Endn|2}}: [[The Horus Heresy Book One - Betrayal]], pgs. 29-31
*{{Endn|3}}: [[Codex: Ultramarines (2nd Edition)]], pg. 3
*{{Endn|4}}: [[Exemplary Battles of the Age of Darkness: The Battle of Calth - Underground War]], pgs. 3-5
*{{Endn|5}}: [[Storm of Damocles (Novel)]], Chapter 12

[[Category:The Horus Heresy]]
[[Category:Formations (Ultramarines)]]