Auxiliaries

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Auxiliaries are troops that act in support of the army they serve.

During the Great Crusade, several units of the Imperial Army were raised from, or trained on, the homeworlds of the Space Marine Legions, and accompanied their "parent" legions on their Expeditionary Fleets, naturally adopting many of the same traditions, organization, and livery.

Sources

Unit	Legion	Homeworld	Notes
Janissaries	Iron Warriors	Castellax
Selucid Thorakite	Iron Warriors	Olympia
Prospero Skyguard	Thousand Sons	Prospero
Prospero Spireguard	Thousand Sons	Prospero
Ultramar Defence Auxilia	Ultramarines	Ultramar