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M40
From Lexicanum
| Year | Event | Source |
| 052.M40 | The Necron Olotep Dynasty awakens to find its planet Cocholos dead. The dynasty's Lords drive their warriors through twisting passageways and encounter the Daemon Prince Beublghor, who had slaughtered the human population and hollowed out the core for his throne. Beublghor's forces crush the Necrons and take their heads as trophies. | Codex: Chaos Daemons (6th Edition) pg. 22 |
| 101.M40 | The Star Phantoms home world of Haakonath is lost to an enormous Hrud migration, although around one third of the Chapter's forces are able to escape. | Imperial Armour Volume Ten - The Badab War - Part Two, pp. 135-136 |
| 109.M40 | The Dennar IV Suppression. The Howling Griffons defeat a Chaos Cultist uprising on Dennar IV. | Imperial Armour Volume Nine - The Badab War - Part One, pg. 126 |
| 123.M40 | The "Threefold Curse": Battlefleet Calixis loses Fire of Heaven and two of the original Chalice-class battlecruisers fighting xenos in the Hazeroth Abyss. Two watch stations are also destroyed. No trace of the unknown xenos is ever found. | Rogue Trader: Battlefleet Koronus pgs. 22, 55 |
| 137.M40 | The Executioners Chapter slays the heretic Rogue Trader Hektor Revvokan. His ship, the Night Hag, is cleansed and refitted to suit the Chapter's needs. | Imperial Armour Volume Ten - The Badab War - Part Two, pg. 88 |
| 140.M40 | The Death Spectres are ambushed by the Kabal of the Envenomed Thorn during an offensive on Vern IV, losing almost all of their Predator Destructors. After the intervention of the Void Dragons pirate fleet, the Space Marines are forced to retrofit a dozen Rhinos to Predators. | White Dwarf 271 (UK), pg. 56 |
| 228.M40 | The Fire Hawks Chapter carry out the First Castigation of Golgotha. | Imperial Armour Volume Nine - The Badab War - Part One, pg. 69 |
| 300-307.M40 | The Aschen War. | Imperial Armour Volume Ten - The Badab War - Part Two, pg. 126 |
| 365.M40 | Two Valhallan Polar Guard regiments drive the Demiurg out of the Poretta system. | White Dwarf 286 (UK), pg. 29 |
| 389.M40 | Imperial governor Calid Braygan of Locara colony, Drusus Marches, Calixis Sector, is executed by quartering for heretical dealings with the Servants of Twilight. | Dark Heresy: Disciples of the Dark Gods pg. 12 |
| 411.M40 | End of the Fenright Tithe Wars. | Imperial Armour Volume Nine - The Badab War - Part One, pg. 92 |
| 454.M40 | Defence of Balle Alpha. | Imperial Armour Volume One - Imperial Guard and Imperial Navy. |
| 485.M40 | The Alpha Legion invades Ghorstangrad. Hypnotic warfare activates the sleeper agents placed among the population and the Emperor's Swords Space Marines. Within hours, the world is devastated and the Emperor's Swords are effectively destroyed. The Alpha Legion withdraws to the Eastern Fringe with loyalist gene-seed and plenty of new recruits. | Codex: Chaos Space Marines (6th Edition) pg. 24 |
| 550.M40 | The Alpha Legion and Night Lords instigate an uprising that destroys Grymm's Landing, a Dark Angels recruiting world. | Codex: Dark Angels (6th Edition) pg. 24 |
| 561.M40 | Nexxas Exculpation. An Emperor's Children invasion is defeated by a complete Imperial army corps. To maintain secrecy, the corps is afterwards bombarded and destroyed from orbit by an Ordo Malleus war ship. Imperial records were revised to blame the slaughter on renegade Eldar. | Realm of Chaos: Slaves to Darkness, pg. 247 |
| 567.M40 | First mention of Lysander of the Imperial Fists in the Liber Honorus Imperial Fists after his victory at the Battle of Colonial Bridge on Iduno. | Codex: Space Marines (4th Edition) pg. 47. |
| 585.M40 | Lysander takes command of the Second Company of the Imperial Fists after capturing the Eldar cruiser Blood of Khaine. | Ibid. |
| 600.M40 | Ork warboss Garskrak picks a fight with Vior'la sept. The Tau lure his army into the plasma storm between Vior'la's twin suns, where he is incinerated. | Codex: Tau Empire (6th Edition) pg. 28 |
| 643.M40 | Inquisitor Malachi Heritor creates the Pyroclast order. | Dark Heresy: Daemon Hunter pg. 56 |
| 675.M40 | Hive World Vidium lost to Dark Eldar. | |
| 700.M40 | Approximate start of Kroot expansionist phase. | |
| 827.M40 | Ultramarines Shield Bearers of Alutia take a warrior pilgrimage through Ryza, Catachan, and Arkios | Codex: Space Marines (4th Edition) inside back cover |
| 896.M40 | The Thraxians, Greet, and Formosians join the Tau Empire. The Hrud and Arachen reject the Water Caste envoys and are driven out of the region. | Codex: Tau Empire (6th Edition) pg. 28 |
| 901.M40 | The Mantis Warriors Space Marine Chapter lure the Dark Eldar reavers known as the 'Slave Lords' into an ambush on Tranquility. | Imperial Armour Volume Ten - The Badab War - Part Two, pp. 67-68 |
| 924.M40 | A Vindicare Assassin destroys a Gargant and terminates Warlord Urglak the Unstoppable on Roxanzand. | |
| 989.M40 | Yme-Loc Eldar Craftworld is first detected in Segmentum Obscurus, West Quadrant | Codex: Eldar (3rd Edition) |
| 995.M40 | The Macharian Crusade begins. | Warhammer 40,000 5th Edition Rulebook |
| Late M40 | Chaos forces steal the designs for the Infidel Heavy Escort en-route to Mars during the Monsk Conspiracy | Imperial Armour Volume One - Imperial Guard and Imperial Navy |
| M39 | Timeline | M41 |
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