Changes

Only once a world was declared fully compliant would the Third Echelon, or [[Imperialis Militia]], be deployed. These troops often were formed for a core of former Second Echelon troops as well as many new locally raised personnel. The duty of the Third Echelon was to combat piracy, civil unrest and to act as the first line of defense against any new threats that may emerge despite often being woefully outmatched against more formidable enemies. Unlike the first and second echelons, these troops had no standardisation with regards to equipment, technology levels or training. Rarely deployed off-world and not particularly loyal to the [[Imperial Truth]], during the subsequent [[Horus Heresy]] Third Echelon troops were often used as cannon fodder, especially by the Traitor Legions.{{Fn|42}}

The largest single organisational unit in the Imperial Army was the [[Expedition Fleet]], each of which was controlled by a [[Lord Commander#Imperial Army|Lord Commander]] unless an Astartes officer was attached{{Fn|3}}. 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 Fleets{{Fn|4}}. Expedition Fleets each had hundreds of thousands of ships and a large amount of Army personnel for ground warfare, the entirety of the Imperialis Armada transporting and supplying many billions of troops.{{Fn|41b}}

====Organisation of Imperial Army Regiments====

**{{Endn|12a}}: pg. 64

**{{Endn|12b}}: pgs. 357–362

*{{Endn|13}}: [[Imperial Armour Volume One - Imperial Guard and Imperial Navy]]

**{{Endn|13a}}: pg. 31