I am wondering if there has been anything firmly established on how a Legion was actually structured? I know that the Legion was divided into chapters. Each Chapter had up to 10 Companies. Each Company was roughly 1000 marines strong. But how were these companies broken down? Did each basically function as a modern Chapter, complete with veterans, scouts, and so forth? Were they further broken down into smaller command structures? The books kind jump between 10 man squads or whole chapter sized engagements. There was talk about doing a Horus Heresy campaign, and this kind of knowledge could be helpful.