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From Warhammer 40k - Lexicanum
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The 10th Chapter was operating at the [[Eastern Fringe]] by 007.[[M31]], far away from other Imperial forces. Accordingly, it was not able to join the [[Calth Muster]] and did not take part in the [[Battle of Calth]], becoming one of the so-called "unmarked" Ultramarines formations.{{Fn|1}}
Following the [[Shadow Crusade]], [[Roboute Guilliman]] sent the 10th Chapter (under [[Arceas Odinathus]], alongside additional forces) , to the northern regions of [[Ultima Segmentum]], where . There they fought various Traitor and third-party contingents.{{Fn|22b}} In the late Horus Heresy, Odinathus rallied various loyalist contingents across the [[Dominion of Storms]] in the northeastern Galaxy to retake the important world of [[Honourum]].{{Fn|2a}}
==Known Actions==
*'''007.[[M31]]''': Operations at the [[Eastern Fringe]]{{Fn|1}}
*'''???.M31''': Destruction of [[World Eaters]] garrison of [[Taur]]{{Fn|22b}}*'''???.M31''': Destruction of [[Word Bearers]] garrison of [[Caith Laes]]{{Fn|22b}}*'''011.M31''': [[Battle of Desperation]]{{Fn|22b}}*'''013.M31''': Battle of [[Honourum]]{{Fn|2a}}
==Known units==
*[[104th Company (Ultramarines Legion)|104th Company]]{{Fn|22b}}*[[108th Company (Ultramarines Legion)|108th Company]]{{Fn|22b}}
==Known Members==
==Sources==
*{{Endn|1}}: [[The Horus Heresy Book Five - Tempest]], pg. 33
*{{Endn|2}}: [[The Horus Heresy Book Six - Retribution]]**{{Endn|2a}}: pg. 31, ''013.M31: A Return to Honour''**{{Endn|2b}}: pgs. 140–143
[[Category:Formations (Ultramarines)|Legion Chapter 10]]
[[Category:The Great Crusade]]
[[Category:The Horus Heresy]]
