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Imperial Army

From Lexicanum

The Imperial Army was the largest military force in the early Imperium, and was founded during the early Great Crusade to fill the need for more manpower to support the Astartes Legions, and quickly was used to garrison worlds, perform sieges, and mass invasions¹. The Imperial Navy was a subset of the Imperial Army and was subordinate to it², and both of them were subordinate to the Astartes command structure¹.

1 History
2 Organisation and Recruitment of the Imperial Army
- 2.1 Recruitment
- 2.2 Organisation
3 Organisation of the Imperial Navy
4 Notable regiments
5 Notable fleets
6 References

History

The genus of the armed force that was to become the Imperial Army was on Terra, in the form of the few Strife-era military formations that the Emperor allowed to continue in his service after the end of the Unification Wars. These surviving units in time became referred to as the Old Hundred, and formed the initial nucleus of human soldiery at the very beginning of the Great Crusade³.

When the Emperor left Terra on the Great Crusade, it is said that he would expect the inhabitants of the worlds he conquered to maintain defences and armed forces for their own safety, against internal rebellion and external invasion; similar to the role of Planetary Defence Forces in the 41st millenium. It is out of these forces that the Imperial Army was first formed. Initially used as garrison forces, they were quickly pushed to the forefront of the Crusade².

The Imperial Army's subordination to the Astartes Legions led to the Imperial Army tearing itself apart in the Horus Heresy, when half of the legions rebelled against the Emperor, and took their Army regiments with them. Thousands of Army commanders took it upon themselves to carve themselves their own empires, with no loyalty to Horus or the Emperor, and it was centuries before the Imperium was reforged.

In the aftermath of the Horus Heresy many changes were made to the structure of the Imperial armed forces. Many of these changes were made to ensure to no single individual would be powerful enough ever again to attempt to overthrow the ruling body of Imperium if he turned traitor. It was during these post-Heresy reforms that the Imperial Army was split into two organisations: the Imperial Guard and the Imperial Navy; the link between them was severed. Imperial Guard commanders now have no authority over the Navy personnel transporting them and are forbidden from being able to command a navy force².

Organisation and Recruitment of the Imperial Army

Recruitment

The Imperial Army was recruited from each world in the Imperium unless exempted (such as Astartes homeworlds, Forgeworlds, and planets in the Sol System, though some of the regiments from the Unification Wars of Terra were allowed to fight in the Great Crusade), but the size of the tithed forces was dependent on the population of the planet, and Imperial administrators determined the amount of soldiers and war materiel demanded¹.

Organisation

The largest single organisational unit in the Imperial Army was the Expedition Fleet, each of which was controlled by a Lord Commander unless an Astartes officer was attached³. By the time of the Ullanor campaign and the inauguration of Warmaster Horus, there were 4,659 Primary Expedition Fleets (with 372 of those in refit at the time) and more than sixty thousand Secondary Expedition Fleets⁴. Expedition Fleets each had several ships and a large amount of Army personnel for ground warfare.

The organisation of individual regiments varied immensely because of the massive lack of standardisation within the Imperial Army², and this could cause issues including friendly fire, and it would not be until the introduction of the Departmento Munitorum that these issues were partially resolved⁵.

However, the largest permanent organisational unit during the Horus Heresy for the Imperial Army was the regiment, and to take a typical example, regiments could be divided into three or more battalions, with each battalion made up of two or more companies, with additional support units attached at the battalion and regimental level⁶.

Organisation of the Imperial Navy

In the Imperial Navy, the highest rank was the Master of the Fleet, who was under the authority of the Lord Commander or Astartes officer in the Expedition Fleet. Other common ranks include Shipmaster (in control of a ship), and Executive Officer (second in command)⁴. Some fleets, like the Saturnine Fleet, have retained their old ranks from before the Unification Wars.