Space Marine Legions - Generic Space Marine Legion Order of Battle: By the time of the middle years of the Great Crusade, there was great variation in each Space Marine Legion's order of battle and size. However, in the most generalised sense, a Space Marine Legion was a force comprised of approximately 11 or more smaller sub-units known as Chapters, each subsequently further divided into a deep hierarchy of smaller sub-units led by officers whose rank terminology often differed from Legion to Legion.The order of battle presented here should be considered generic and to be superseded by the more specific structure and rank terminology of a given Legion, if such information is available within current Imperial records.Legion Command: Primarch or Legion Master (if the Legion's Primarch had not been rediscovered)Praetorate or Ancients of the Legion (Senior Staff Officer Cadre)Consular Representatives [Senior representatives of the Armourium, Astropathic Chamber, Navigators-Plenipotentiary, Librarus (if present in Legion), Apothecarion, Masters of the Fleet, Castrum of Ordnance, Castellans of Domain, et al]Vexillarius (Legion Standard Bearers, Subalterns and Equerries)Honour Guard (Praetorian Bodyguard Formations for Primarch -- number and structure varied by Legion)Legion Assets:Planetary DomainsCapital Class WarshipsSecondary Escort SquadronsLegion ArmouriumLegion ApothecarionLegion Librarus (if present in Legion)Auxiliary Forces (Non-Space Marine, usually Imperial Army)Legion Support Corps (Victuallers, Commissary, Legion Serfs, Indentures, Servitors, etc.)Chapter I (Chapters were alternatively designated as Great Companies, Harrows, Millennials, etc.)Originally each Chapter was composed of roughly 1,000 line Astartes, but as the Legions grew, this number began to vary substantially by Legion, and also through the vicissitudes of war and the availability of replacement recruitsChapter IIChapter IIIChapter IVBattalion I (Battalions were alternatively designated as Cohorts, Regiments, Battle Groups, etc.)Battalion Command (Example): Lieutenant Commander (alternatively designated as Commander, First Captain, Shadow Captain, Marshal, Legate, etc.)Battalion Consuls (Senior Specialists and Advisors)Battalion Vexillarius (Standard Bearers, Subalterns and Equerries)Battalion Command BodyguardBattalion Assets:Strike CruisersNavigators OrdinaryDrop Pods and RamsLight Gunship SquadronsSuper-heavy DetachmentsSkimmer Strike DetachmentsSupport Artillery DetachmentsTechmarine CovenantsApothecarion SectionsDreadnought TalonsReconnaissance SectionsCompany I (Companies were alternatively designated as Maniples, Bands, Brotherhoods, etc.)Nominally Battalions numbered five companies, each of a hundred Legionaries -- Company I was composed of Veterans and other elite units, II, III and IV were line companies and the V Company was comprised entirely of specialist troops such as dedicated Assault, Outrider or Destroyer units. However, in practice many larger Legions regularly exceeded this number of companies, maintaining battalions with seven or ten companies each folded under a particular command, while individual companies also varied in strengthCompany IICompany IIICompany IVCompany VCompany Command (Example): Company Captain (alternatively Centurion, Prime, Wolf Lord, Blooded, etc.)Company Standard BearerCompany Command Bodyguard SquadCompany Assets:Heavy Support Squads (5-10 Space Marine Legionaries)Assigned Veteran or Specialist Squads (Various)GunshipsRhino Armoured TransportsTank DetachmentsSupport Weapons BatteriesDreadnoughtsTechmarinesApothecaries1st LieutenantLieutenants were the most junior officers of the Legion. They also differed in designations such as Dominar, Decurion, Pack Leader or Chieftain, and in some Legions the numerical positioning of the officer within the Company indicated seniority or ceremonial role and had further titles in rankLegion Tactical Squad (10-20 Space Marine Legionaries)Legion Tactical Squad (10-20 Space Marine Legionaries)Support Squad (5-10 Space Marine Legionaries)2nd LieutenantLegion Tactical SquadLegion Tactical SquadLegion Tactical Support Squad3rd LieutenantTactical SquadTactical SquadLegion Tactical Support SquadCompany VICompany VII (etc.)Battalion IIChapter VChapter VIChapter VIIChapter VIIIChapter Command (Example): Lord Commander (Alternatively Chapter Master, Khan, Warsmith, Magister, etc.)Chapter Consuls (Senior Specialists and Advisors to the Lord Commander)Chapter Vexillarius (Chapter Standard Bearers, Subalterns and Equerries)Chapter Command BodyguardChapter Assets:Chapter Flagship Battle-Barge/Capital ShipPlanetary Assault Craft and Drop ShipsEscort SquadronsGunship SquadronsChapter ArmouriumLegion Armoured DivisionsBattalion IBattalion IINominally each battalion was composed of five hundred line Legionaries each, as well as various specialists and support staffChapter IXChapter XChapter XI (etc.)