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M40
From Lexicanum
| Year | Event | Source |
| 454.M40 | Defence of Balle Alpha. | Imperial Armour Volume One - Imperial Guard and Imperial Navy. |
| 561.M40 | Nexxas Exculpation. An invasion by the Emperor's Children 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, p. 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). |
| 585.M40 | Lysander takes command of the Second Company of the Imperial Fists after capturing the Eldar cruiser Blood of Khaine. | Codex: Space Marines (4th Edition). |
| 666.M40 | An Imperial patrol force engages Necron warships in the Yuctan system. Only a single Cobra Class Destroyer escapes; when Imperial fleet returns, all colonists are missing. Becomes known as Yuctan Incident | The Harvester and the Hive |
| 675.M40 | Hive World Vidium lost to Dark Eldar. | |
| 700.M40 | Approximate start of Kroot expansionist phase. | |
| 762-771.M40 | Catachan 18th fighting on Koralkal VIII against Tyranid infestation (the final two years were spent in decontamination) | |
| 827.M40 | Ultramarines Shield Bearers of Alutia take warrior pilgrimage through Ryza, Catachan, and Arkios | Codex: Space Marines (4th Edition) inside back cover |
| 924.M40 | Vindicare Assassin destroys Gargant, terminates Warlord Urglak the Unstoppable on Roxanzand. | |
| 989.M40 | Yme-Loc Eldar Craftworld 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 | Designs for Infidel Heavy Escort stolen by Chaos en-route to Mars during the Monsk Conspiracy | Imperial Armour Volume One - Imperial Guard and Imperial Navy |
| M39 | Timeline | M41 |
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