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From Warhammer 40k - Lexicanum
→History
Prior to the campaign, Planetary Governor [[Aulis]], head of the Taros government, developed friendly trading relations with the Tau, and sought to defect to the [[Tau Empire]] with the support of much of the planetary population.{{Fn|1c}}
When his treachery was unveiled, the [[Avenging Sons]] [[Space Marine]]s were called upon to assassinate Governor Aulis in what was to be the [[First Taros Intervention]]. The [[Avenging Sons]] were unable to carry out the assignment after suffering tremendous losses including one [[Space Marine Dreadnought|Dreadnought]] at the hands of the Tau forces already assigned to protect the capital [[Tarokeen]] and the governor.{{Fn|1d}} Following the assassination attempt the [[Tau]] officially annexed Taros while the Imperium gathered the [[4621st Imperial Army]] to reclaim the planet.{{Fn|1e}}
A large scale invasion followed, including fleet actions within the [[Taros System]]{{Fn|1f}}, however in the end Imperial forces were forced to retreat after suffering heavy losses including more than five complete [[Imperial Guard Regiment]]s' worth of troops, one [[Warhound Titan]] and several [[Imperial Navy]] vessels.{{Fn|1g}}