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

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 armored formations;{{Fn|1h}} formed the [[Aurora Chapter]] in the [[Second Founding]]{{Fn|3}}*[[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]]: reduced to less than 1,000 warriors at during the [[Battle of Calth]]{{Fn|1b}}*[[9th Chapter (Ultramarines Legion)|9th Chapter]]: led by [[Chapter Masster Master]] [[Klord Empion]] and assigned the [[Battle Barge|battlebarge ]] ''[[Phaunos]]''; completely destroyed at 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}}*[[14h Chapter (Ultramarines Legion)|14th Chapter]]{{citethis}}*[[15th Chapter(Ultramarines Legion)|15th Chapter]]: reduced to less than 1,000 warriors at during the [[Battle of Calth]]{{Fn|1b}}*[[16th Chapter (Ultramarines Legion)|16th Chapter]]{{Fn|1n}}*[[17th Chapter (Ultramarines Legion)|17th Chapter]]{{Fn|1i}}*[[18th Chapter (Ultramarines Legion)|18th Chapter]]{{Fn|1i}}*[[19th Chapter(Ultramarines Legion)|19th Chapter]]: Evocatii {{Fn|Note 2}} formation; not present at the Battle of Calth and thus "unmarked" {{Fn|1g}}*[[22nd Chapter (Ultramarines Legion)|22nd Chapter]] (the "[[Nemesis]]"): known for containing most of the legion[[Space Marine Legion|Legion]]'s [[Destroyer Marine]]s, i.e. the [[Nemesis Destroyers]]{{Fn|1e}}*[[24th Chapter (Ultramarines Legion)|24th Chapter]]: Evocatii {{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}}*[[25th Chapter(Ultramarines Legion)|25th Chapter]]: Evocatii {{Fn|Note 2}} formation; garrisoning and training in [[Ultramar ]] by the [[Battle of Calth]], thus "unmarked"{{Fn|1g}}{{Fn|Note 1}}

==Trivia=={{trivia}}===Notes===*{{Endn|Note 1}}: "unmarked": '' to explain''*{{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 grounds units for neophytes[[Neophyte]]s.{{Fn|1j}}

*{{Endn|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|2}}: [[The Horus Heresy Book One - Betrayal]], pg pgs. 29-31

[[Category:Vessels Formations (Ultramarines)]]