Battle of Trisolian

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The Battle of Trisolian
Date ~011.M31
Scale Void battle
Theatre Horus Heresy
Status Imperial retreat
Space Wolves Sons of Horus
Commanders and Leaders
Leman Russ, Belisarius Cawl Horus
~40,000 Marines, the near entirety of remaining Space Wolves; Mechanicum loyalists ~50 capital ships; Sons of Horus Legion; elements of Word Bearers, World Eaters, Alpha Legion, Night Lords & Iron Warriors; Mechanicum Traitors
Extremely High, several companies reduced to less than 20% strength Not known
Effectively ended the Space Wolves as a "Legion", who retreated to Yarant.
Horus badly wounded/partly de-corrupted.
Leman Russ badly wounded.

The Battle of Trisolian is the ill-fated attempt by Leman Russ to kill Horus before the inevitable Siege of Terra. It also marks the earliest appearance of a young Belisarius Cawl who is a mere up-and-coming but still notoriously unconventional tech-adept by this stage.


Late in the Horus Heresy, the Space Wolves legion had lost around 25% of their forces at Prospero and had taken a further maulings at the Battle of the Alaxxes Nebula, coupled with engagements at Vanaheim and Daverant, reduced their number to around forty thousand marines. Following Alaxxes the remnant returned to Terra to coordinate with the loyalist forces.

Leman Russ sponsored a stealth mission by the Knights-Errant on the Vengeful Spirit during the Battle of Molech in order to gauge any weaknesses in the traitor dispositions and report back on the state of Horus himself. However, the mission went sour when they were discovered, leading to the deaths of several of the Knights-Errant involved when the Warmaster decided to make examples of them.

Following the completion of this mission, Sanguinius and Jaghatai Khan had also arrived on Terra and convened a war council to determine the next course of action: Rogal Dorn urged that all remaining forces maintain a defensive posture, but was appreciative that the Ultramarines and Dark Angels were assaulting the traitors' rear and providing relief to loyalist forces, allowing them to dictate the next few battles. Dorn declared that Terra was too confined a battlezone for the loyalist contingent of Titan Legions and so proposed a muster at Beta-Garmon and make a stand there in order to give time for Roboute Guilliman and Lion El'Jonson to crush the traitors in a pincer movement. The Battle of Beta-Garmon would itself become the site of one of the greatest battles in the entire Horus Heresy.

However, Leman Russ would not be swayed from his original plan and chose to depart from Terra for Fenris in order to scry a weakness in the superhuman upgrades that Horus gained at Molech, determining that he should take the oft-maligned "Spear of Russ" with him.

The Battle[edit]

The battle itself took place over the Forge World of Trisolian A-4, which had recently been captured by traitor forces following a surrender of Mechanicum forces, although a loyalist faction of Skitarii led by Cawl continued to fight against the traitors.

Russ really wanted Horus's wolf pelt

The Space Wolf fleet used the unique gravitational properties of the three stars of the Trisolian star system to approach with stealth and speed, using most of their ships as a distraction while Russ own flagship engaged the Vengeful Spirit directly, allowing him to board with thousands of marines.

Russ had already figured that the battle would result in a loss for his forces, but thankfully Cawl's loyalist Mechanicum elements on the Forge World managed to overthrow the regime and revert the planet back to loyalist control, allowing it to lend a hand in the conflict.

Aboard the flagship; Russ engaged Horus directly and managed to score a wound with the Spear and allow Horus a moment of clarity where his brother would plead with him to rejoin the Emperor's cause. Horus still rejected the offer and the fight continued until Russ was beaten and defeated, though Horus was prevented from delivering the killing blow by a mob of hundreds of Space Wolves who literally dogpiled him, allowing Bjorn to drag him from the battlefield and back to the Loyalist fleet.


The Space Wolves were mauled further still, with some companies being reduced to less than a fifth of their already diminished forces, this effectively ends the existence of the VIth "Legion", though Horus ordered his forces to hunt down their remnants anyway and return Russ's head to him.

With their Primarch unconscious from his injuries, the remaining Space Wolf commanders have to make a decision of whether to stay together and likely die, or disperse and play no further part in the Horus Heresy. Choosing to remain together to present a viable threat that the traitors would have to divert resources to deal with, they retreat to Yarant III to make a stand where they are hunted by Failbaddon but are eventually saved by Corax following his own gene-seed debacle.

Horus was partially cleansed of the corruption he gained at Molech after being wounded by the Spear of Russ and a momentary glimpse of the original Primarch is witnessed by his brother, granting him enough self control to reject the Chaos Gods but continued the campaign on his own terms. Lorgar believed that Horus' failure to submit to the gods' will but still accepting their gifts would lead them to withdraw their power when he needed it most and cause the war to be lost. Horus later fell into a coma at the aforementioned battle at Beta-Garmon as his wound reopened, and Lorgar attempted a coup.

A shard of Horus' soul that had been purified by the Spear of Russ would be fought over by the Chaos Gods, requiring the sacrifice of Maloghurst in order to free him and Lorgar was expelled from the Warmaster's fleet after his coup failed, with Horus warning that he would kill Lorgar if he ever saw him again.

Timeline of Warhammer 40,000
The Times of Old Wars of Secession - War in Heaven (60.000.000 BC) - Fall of the Eldar (M30)
Pre-Heresy Age of Terra (M1-M15) - Dark Age of Technology (M15-M25) - Age of Strife (M25-M30)
Great Crusade (M31) The Last Church - Interex - Faash - Council of Nikaea
Horus Heresy (M31) Battle of Isstvan III - The Burning of Prospero - Drop Site Massacre - Thramas Crusade
The Battle of Phall - Battle of Calth - Signus Campaign - Imperium Secundus - Siege of Terra
Time of Rebirth (M31-M32) The Great Scouring (M31) - Start of The Long War (M31) - The Legion Wars (M31)
The Battle of Skalathrax (M31) - Creation of the Codex Astartes (M31) - Second Founding (021.M31)
The Forging (M32-M34) The War of The Beast (544.M32-546.M32) - The Beheading (546.M32)
Nova Terra Interregnum (M34-M36) 21st Founding (M36)
Age of Apostasy (M36-37) Plague of Unbelief (310.M36)
Age of Redemption (M37-M38) Abyssal Crusade (321.M37-121.M38)
The Waning (M40-M41) Gothic War (143-151.M41) - The Macharian Crusade (392-399.M41) - The Macharian Heresy (400-470.M41)
Wars for Armageddon (444.M41, 941.M41 and 991.M41) - Damocles Crusade (742.M41)
Time of Ending (M41) The Vaxi Atrocity (731.M41) - First Tyrannic War (745-746.M41) - Sabbat Worlds Crusade (755.M41-780.M41)
Siege of Vraks (813.M41-830.M41) - Massacre at Sanctuary 101 (897.M41) - Badab War (901-912.M41)
The Vaxhallian Genocide (926.M41) - Second Tyrannic War (990.M41-993.M41) - Third Tyrannic War (997.M41-999.M41)
Octarius War (999.M41) - 13th Black Crusade (999.M41-ongoing)
Age of the Dark Imperium (M42-ongoing) Indomitus Crusade (M42) - Ultima Founding (M42) - Plague Wars (M42) - War of Beasts (M42)