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{{SpaceMarinesPortal}}

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.