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Despite all the fear and hatred, on certain occasions short-termed military alliances have been established with the '''Eldar'''. These temporary alliances are somewhat uncommon but not unheard of. They are made against a common enemy like the forces of [[Chaos]], Tyranids or Orks. The [[Imperial Navy]], units of the [[Imperial Guard]], and even detachments of Space Marines have, on certain occasions, fought beside Eldar forces. A fine example for this is the [[Gothic War]], during which the Imperium allied itself with the Eldar of the An-Iolus Craftworld against the forces of [[Ezekyle Abaddon|Abaddon the Despoiler]]. No temporary alliances with the [[Tau ]] have been made, but short-termed truces have happened.

Some human organizations like , including some factions of the Inquisition, individual [[Navigator]] families, the [[Illuminati]] brotherhood, etc., even have certain secret dealings and alliances with the Eldar. All these agreements are always a carefully guarded secret secrets, as they would be considered treason by other more conservative factions of the Imperium. One such pact is the [[Coven of Isha]].

The '''[[Tau]]''' deliberately foster such developments, trading with nearby Imperial systems and preaching the ideals of the [[Greater Good]]. As a result a very small number of Imperial governors on the frontiers of the [[Ultima Segmentum]] have recently seceded from the Imperium, pledging their allegiance and the loyalty of their respective worlds and star-systems to the Tau empire.