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{{SpaceMarinesPortal}}
[[Image:SMChapterOrgNew.jpg|thumb|right|Organization of a Codex-Compliant Space Marine [[Chapter]] since the introduction of [[Primaris Space Marines]]{{Fn|18}}]]
The '''Codex Astartes''' is the doctrine of the [[Space Marine Chapter]]s, governing all aspects of Chapter organisation and battlefield tactics. For any given tactical situation, the Codex has hundreds of pages devoted to how it may be met and overcome. The wisdom of thousands of Imperial warriors has contributed to the Codex, and details on everything from unit markings to launching a full-scale planetary assault are contained within its pages.
==Organisational Doctrine==
[[Image:CodexOrganisation.jpg|right|300px|thumb|Pre-[[Primaris Space Marine]] Codex Astartes Space Marine Chapter organisational chart.]]
The Codex states that a Space Marine [[Chapter]] should be split into 10 [[Space Marine Company|companies]] of 100 Marines each, plus a [[Space Marine Captain]], [[Apothecary]], [[Company Standard]] and [[Chaplain]] for each one.{{Cite This}} In the reforms by [[Roboute Guilliman]] after his return to the [[Imperium]] at the end of [[M41]], two [[Lieutenant (Space Marines)|Lieutenants]] serve directly below the Company Captain, commanding two demi-companies.{{Fn|15}}
*{{Endn|16}}: [[Codex: Vanguard Space Marines (8th Edition)]], pg. 5
*{{Endn|17}}: [https://www.warhammer-community.com/2019/08/03/apocalypse-mega-battle-and-warhammer-40000-previewgw-homepage-post-1/ Apocalypse Mega-battle and Warhammer 40,000 Preview!] (Last Accessed July 3rd 2019)
*{{Endn|18}}: [[Codex: Space Marines (8th Edition, 2nd Codex)]] pg.16-17
===Uncited===
