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From Warhammer 40k - Lexicanum
→The Horus Heresy
Having been thus deliberately removed from the board by the machinations of Chaos{{Fn|2b}}, the Thousand Sons played no part in the birth of the Horus Heresy. In fact, exactly when and why they chose to ally themselves with Horus and his traitorous rebellion is not clear, although it is believed that their chief motivation was to gain sanctuary and protection from further Imperial attack.{{Fn|6}} Of course, considering how Tzeentch had orchestrated events so far, it is likely that they had little choice in the matter at all.{{Fn|7}}
After their escape from Prospero, the Thousand Sons discovered that - once again - they had been reduced to only around ''one thousand'' living members.{{Fn|2}} Their actions during the bulk of the Heresy are not currently known, but when though a portion of the Legion did engage the Space Wolves at the [[Battle of Yarant]]. When Horus's forces fell on Terra itself some years later, Magnus and the Thousand Sons were with him. Noted to be a very small contingent of the Chaos forces, the Thousand Sons contented themselves with summoning [[daemons|daemonic reinforcements]] and casting supporting spells rather than engaging in pitched battle for most of the [[Siege of Terra]]. However, once the outer walls of the [[Imperial Palace]] had been breached, the Thousand Sons found themselves required to break down the final wards and fortifications of the inner palace itself. Advancing to the [[Ultimate Gate]], part of the legion held off Imperial counter-attacks while the senior sorcerers attempted to destroy the defences with psychic power and sorcerous ritual. This assault came to naught however, as a contingent of [[Imperial Fists]] led by Rogal Dorn arrived in the combat zone and drove the Thousand Sons off at much the same time as the Emperor himself directed the surviving Librarians of the [[Blood Angels]] and Imperial Fists to block the attacks of the Thousand Sons sorcerers.{{Fn|1a}}
The Thousand Sons retreated from Terra after the death of [[Horus]] alongside the other Chaos forces,{{Fn|1a}} before using their sorcerous powers to open a warp route that would transport their fleet directly to the Planet of Sorcerers.{{Fn|7}}
