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Istvaan 5 Isstvan V was the site of the near demise of the [[Iron Hands]], [[Salamanders]] and [[Raven Guard]] loyalist [[Space Marine]] [[Space Marine Legion|Legions]] following a trap set by [[Horus]]. The plan essentially consisted of opposing the loyalist marines with the openly [[Traitor Legion|traitorous legions]] the [[Sons of Horus]], [[World Eaters]], [[Death Guard]] and [[Emperor's Children]]; followed by having the [[Night Lords]], [[Iron Warriors]], [[Word Bearers]] and [[Alpha Legion]], who were believed to be loyal but were actually pledged to Horus, stab the loyalists in the back. It resulted in the almost complete annihilation of the three loyalist legions against 7 traitor legions, with only a few battle brothers escaping alive, and left the Imperium severely weakened in the face of Horus' onslaught.{{NoLead}}{{Planets