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The By the late [[Great Crusade]], the [[Ultramarines ]] Legion was organized into 25 Chapters,{{Fn|1a}}{{Fn|1k}}, each organized in multiple Battalions and Companies, and made up of roughly 10100,000 Astartes.{{Fn|2}}{{Fn|1j}}.

== Known Chapters deployed during chapters ==By the time of the Calth muster Muster, the Ultramarines included{{Fn|1a}}:*1st (Chapter: noted for their effective deployment of superheavy tanks during Calth) {{Fn|1f}}*2nd Chapter{{Fn|1f}}*3rd Chapter{{Fn|1f}}*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: 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}}*8th Chapter: reduced to less than 1,000 warriors at Calth{{Fn|1b}}*9th Chapter: led by Chapter Masster [[Klord Empion]] and assigned the battlebarge [[Phaunos]]; completely destroyed at Calth{{Fn|1d}}{{Fn|1f}}{{Fn|1l}}*10th Chapter: fighting in the far Eastern Fringe by the Battle of Calth and thus "unmarked"{{Fn|1g}}*11th Chapter{{Fn|1c}}*12th Chapter{{Fn|1c}}*13th Chapter{{Fn|1m}}*14th Chapter*15th Chapter: reduced to less than 1,000 warriors at Calth{{Fn|1b}}*16th Chapter{{Fn|1n}}*17th Chapter{{Fn|1i}}*18th Chapter{{Fn|1i}}*19th Chapter: Evocatii formation; not present at the Battle of Calth and thus "unmarked" {{Fn|1g}}*22nd Chapter (the "[[Nemesis]]") : known for containing most of the legion's [[Destroyer Marine]]s, i.e. the [[Nemesis Destroyers]]{{Fn|1e}}*24th Chapter: Evocatii 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|1h1g}}*25th Chapter: Evocatii formation; garrisoning and training in Ultramar by the Battle of Calth, thus "unmarked"{{Fn|1g}}

*7th (deployed in the far reaches of the Dominion of Storms aboard the [[Thunder of Hera]]), "unmarked" {{Fn|1g}}*8th (reduced to less than 1,000 warriors at Calth){{Fn|1b}}*9th (destroyed at Calth, led by Chapter Masster Klord Empion), assigned the battlebarge [[Phaunos]]{{Fn|1d}}{{Fn|1f}}{{Fn|1l}}*10th (fighting in the far Eastern Fringe), "unmarked" {{Fn|1g}}*11th{{Fn|1c}}*12th{{Fn|1c}}*13th{{Fn|1m}}*14th*15th (reduced to less than 1,000 warriors at Calth){{Fn|1b}}*16th {{Fn|1n}}*17th {{Fn|1i}}*18th {{Fn|1i}}*19th Evocatii, "unmarked" {{Fn|1g}} *22nd (the Nemesis, known for their heavy complement of Destroyers) {{Fn|1e}}*24th Evocatii (garrison and training in Ultramar), known for their use as a strategic reserve force, and large amount of support equipment, "unmarked" {{Fn|1g}}*25th Evocatii (garrison and training in Ultramar), "unmarked" {{Fn|1g}} "unmarked" indicates that the Chapter was not at Calth. "Evocatii" indicates that the Chapter had a large proportion of raw recruits, supported by a core of veterans. Used by Guilliman as training grounds for neophytes. {{Fn|1j}}