Changes

*[[2nd Chapter (Ultramarines Legion)|2nd Chapter]]{{Fn|1f}}

*[[3rd Chapter (Ultramarines Legion)|3rd Chapter]]{{Fn|1f}}

*[[5th Chapter (Ultramarines Legion)|5th Chapter]]{{Fn|1p}}

*[[6th Chapter (Ultramarines Legion)|6th Chapter]]{{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}}

*[[19th Chapter (Ultramarines Legion)|19th Chapter]]: [[Evocati|Evocatii]]{{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}}.

*[[24th Chapter (Ultramarines Legion)|24th Chapter]] ("''The Exitium''"): [[Evocati|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}} however, a small contingent was present at Calth{{Fn|1o}}

*[[25th Chapter (Ultramarines Legion)|25th Chapter]]: [[Evocati|Evocatii]]{{Fn|Note 2}} formation; garrisoning and training in [[Ultramar]] by the [[Battle of Calth]], thus "unmarked"{{Fn|1g}}{{Fn|Note 1}}