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From Warhammer 40k - Lexicanum
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Regiments can also be sub-divided, most often into a number of [[Astra Militarum Company|Companies]]. These number between five and twenty-five, depending on the number of troopers in the Company itself and the quality of their equipment. Battalions are another common subdivision. They are often also called Brigades or other terms, depending on point of regimental origin. The Battalions are strictly administrative groupings, not used in combat engagements. To accomplish specific combat tasks, Regimental Battle Groups, Tasks Groups or Assault Groups may be formed, working alongside groups from other Regiments in a combined- or all-arms grouping.{{Fn|14}} Tasks that are required to be accomplished by Battle Groups range from supporting a lightning-fast armoured breakthrough by [[Chimera]]-mounted infantry and self-propelled artillery to supporting a light infantry force in a jungle fight with a [[Sentinel]] company. Some Battle Groups are simply a balanced mixture of infantry and vehicles, assembled to take a single objective. Battle Groups are commanded by a senior officer, often a [[colonel]] or [[Imperial Guard Captain|captain]]. They vary in size from around a hundred troops and five or six vehicles to a force nearly rivalling a regiment in size.{{Fn|15a}}
Entire Regiments are often combined into huge operational-level forces called Army Groups, commanded by [[general]]s or [[high marshal]]s. These are highly variable in strength, consisting of any number of regiments, with some Army Groups only having as few as two. Other Army Groups contain many hundreds of regiments. An Army Group can be assembled to take and hold an entire planet or even a star system.{{Fn|15a}} Another model of operational-level formations is practiced by the [[Cadian Shock Troops]] and emulated by numerous other regiments from worlds located in the sectors surrounding [[Cadia]]. Herein, an Army Group has at least six Battle Groups, which themselves consist of six to nine Regiments. Additional support is provided by [[Munitorum]] support services, which are assigned to each Battle Group. During the [[13th Black Crusade]] every notable planet nearby to Cadia was assigned a minimum of ten Army Groups for defence, with capital worlds having as many as one hundred.{{Fn|19}}
Should a Regiment survive a campaign, it is unlikely it will return to its homeworld. Instead, it will move to the next war zone. Attrition rates are rectified by amalgamating it with other regiments, and despite a few exceptions new recruits are rarely added to existing regiments. Instead, fresh recruits are put into newly raised forces. While Regiments of the same type and planetary origin are most often merged together to keep it at full strength, it is not unheard of to have two entirely different Regiments merged together. Such was the case when the [[Valhallan 611th Infantry]] was merged with the [[1082nd Recon Armoured Division]], creating the [[Voltan Recon Hussars]] whose infantry clung to the hulls of tanks. Besides doctrinal and training differences, such formations are also plagued by cultural and language barriers. Most commanders consider such regiments inefficient and wasteful but they nonetheless persist in order to quickly field large numbers of soldiers. However it is not always a failure, as was the case when the [[Catachan CLXXXII]] merged with the [[Elysian 90th]] to create the [[Prosan 314th]]. This new regiment proved itself adept at airmobile jungle warfare after being issued [[Valkyrie]]s during the [[Saikong Justification Wars]].{{Fn|13a}}
**{{Endn|18a}}: pg. 32
**{{Endn|18b}}: pg. 33
*{{Endn|19}}: [[The 13th Black Crusade (Background Book)]], pg. 20
[[Category:Troops (Astra Militarum)]]
