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The Loyalist fleet was unaware that after the traitor victory at [[Isstvan V]], [[Horus]] ordered the [[Iron Warriors]] to intercept them, believing such a large force should not go unmolested.{{Fn|2}} Ahead of the attack, Iron Warriors scouting ships collected intelligence on the Retribution Fleet, which was psychically transmitted to hundreds of psi-amplifying devices across the system made up of communication systems cybernetically joined to brutalized astropaths. When these devices received the intelligence gathered by the Iron Warriors scouting vessels, they detonated in massive psychic blasts to transmit their information through the warp storms and back to the main fleet.{{Fn|3c}}
The psychic blasts from the psi-amplifiers subjected the Imperial Fists and their cohorts to painful screams, visions and other psychic affects. While the the event killed a small number of human crew in the Fleet, it was determined not to be an attack but, instead, a psychic signal of some kind. While the Imperial Fists could not determine who was behind planting the devices, they assumed it was the prelude to an attack from an unknown enemy.{{Fn|3e}}{{Fn|4}}
===Iron Warriors Attack===
