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From Warhammer 40k - Lexicanum
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The planet of '''Isstvan V''' is widely known for the infamous '''Drop Site Massacre'''.
At the start of the [[Horus Heresy]], Warmaster [[Horus]] apparently only had 3 three other Primarchs and their respective Legions at his side. Under his command were his own [[Sons of Horus]], joined by [[Angron]] and his [[World Eaters]], [[Fulgrim]] with his [[Emperor's Children]], and [[Mortarion]] and the [[Death Guard]]. After ridding himself of all suspected Loyalist members inside the three Legions at [[Isstvan III]], he choose ''Isstvan V'' as his command post and prepared a deadly trap for his former brothers and their Legions.
The Emperor ordered the deployment of seven full Space Marine Legions against him, agonizing over the betrayal of his most beloved son. Unknown to the Emperor of Mankind, four of the deployed Primarchs and their Legions had already turned against him, forming a "fifth column" which would strike against the Loyalists at the most decisive moment.
