M40

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Year	Event	Source
???.M40	Salt Desert Campaign	Codex: Imperial Guard (3rd Edition, 2nd Codex), pg. 30
010.M40	The Orpheus Sector begins rebuilding after its devastating War of Faith. Libethra is gifted to the Angels Revenant for their role in the war. The "sleepers of Orpheus" gradually fade into myth and legend.	Imperial Armour Volume Twelve - The Fall of Orpheus, pg. 23
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, pgs. 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
319.M40	Evil Sunz warboss Badrok Gutgouga unifies the orks of the Shattered Deeps and threatens a Waaagh! Imperial Guard Konig Armoured Regiments corner his forces at Lysmarchus and crush his forces in a gruelling seven-month campaign. Gutgouga's broken corpse is displayed on the spire of the Red Cathedral of Amraphel.	Imperial Armour Volume Twelve - The Fall of Orpheus, pg. 23
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
433.M40	The High Autarch of the planet Krieg declares independence from the Imperium. Colonel Jurten of the Krieg 83rd turns the planet into an atomic wasteland to eliminate the heresy.	Imperial Armour Volume Five - The Siege of Vraks - Part One, pg. 86
440.M40	Pirate Lord Havax the Cruel terrorizes convoys along the Drusus Marches while his friends in the Lucid Court shield him from reprisal. Navy Admiral Halifax Stophes and Ordo Hereticus Inquisitor Medina grant First Lieutenant Calaphas Zanatov a Turbulent-class frigate and a Warrant of Trade, respectively, with the intent that the new rogue trader will hunt the pirate himself.	Rogue Trader: Hostile Acquisitions, pg. 23
454.M40	Defence of Balle Alpha	Imperial Armour Volume One - Imperial Guard and Imperial Navy[Needs Citation]
474.M40	War Trader Zanatov ambushes Havlax the Cruel's battleship at 41 Pry. After a three-day battle, Zanatov mounts Havlax's corpse on his ship's power ram. Zanatov declines an offer of captaincy in the Imperial Navy and remains a rogue trader, disappearing into the Maw.	Rogue Trader: Hostile Acquisitions, pgs. 23-24
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 Darnath 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
580-591.M40	The Orpheus Sector raises thirty-nine million soldiers to answer the call to arms for the Great Severan War. The Morros Lachrymal penitentiary is converted from mining to a penal legion training facility.	Imperial Armour Volume Twelve - The Fall of Orpheus, pg. 23
585.M40	Darnath Lysander takes command of the Second Company of the Imperial Fists after capturing the Eldar cruiser Blood of Khaine.	Codex: Space Marines (4th Edition), pg. 47
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
617.M40	Draxian Incursion - all records expunged by Inquisition	Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes, pg. 19
619.M40	The Decarchs of Decapolis conspire to replace Amarah as the capital world of the Orpheus Sector. The Ordo Hereticus uncovers the conspiracy while interrogating Celestarii cultists. The architects of the conspiracy are hunted down, purged, and put on show trial over the course of nine years. Authorities on Amarah enact punitive fines and restrictions on Decapolis, doing little to alleviate the unrest the conspiracy has fuelled.	Imperial Armour Volume Twelve - The Fall of Orpheus, pg. 23
643.M40	Garanhir Rebellion	Imperial Armour Volume Two - Second Edition, pg. 19
649.M40	Inquisitor Malachi Heritor creates the Pyroclast order.	Dark Heresy: Daemon Hunter, pg. 56
675.M40	Hive World Vidium lost to Dark Eldar.	[Needs Citation]
676.M40	When Blood Angels Strike Force Alenso succumbs to the Red Thirst and throws itself into the green tide on the moon of Tytus, the Elysian 46th Airborne rescues them from disaster.	Codex: Blood Angels (7th Edition) A Chronicle of Heroes
688.M40	Second Abonian Genocide	Imperial Armour Volume Two (Second Edition), pg. 19
700.M40	Approximate start of Kroot expansionist phase.	[Needs Citation]
745.M40	Trial and execution of of Inquisitor Lord Godella Morn, founder of the Oblationist faction of the Inquisition.	Dark Heresy: The Radical's Handbook, pg. 111
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 T'au 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, pgs. 67–68
917.M40	The Imperial Navy founds Port Wander as a staging ground for investigations into the loss of vessels on the fringes of the Drusus Marches.	Rogue Trader Core Rulebook, pg. 340
924.M40	The Vindicare Assassin Morias Skult destroys a Gargant and terminates Warlord Urgak the Unstoppable on Roxanzand.	Codex: Assassins (3rd Edition), pg. 4
949.M40	Krieg officially returns to the rule of the Imperium. The Departmento Munitorium finds the planet's tithes in arrears and Krieg presents twenty fully-prepared regiments for immediate deployment.	Imperial Armour Volume Five - The Siege of Vraks - Part One, pg. 87
989.M40	Yme-Loc Eldar Craftworld is first detected in Segmentum Obscurus, West Quadrant	Codex: Eldar (3rd Edition)[Needs Citation]
995.M40	The Macharian Crusade begins.	Warhammer 40,000 5th Edition Rulebook[Needs Citation]
999.M40	Rogue trader Purity Lathimon rediscovers the Koronus Passage.	Rogue Trader Core Rulebook, pg. 341
Late M40	Chaos forces steal the designs for a new pattern of Imperial ship en-route to Mars during the Monsk Conspiracy.	Imperial Armour Volume One - Imperial Guard and Imperial Navy, pg. 10

M39	Timeline	M41