From Lexicanum

Year	Event	Source
	Attempts to augment Conqueror Shells, creating Auger Shells but considered a failure.	Imperial Armour Volume One
001.M39	Abaddon's 10th Black Crusade. The Conflict of Helica. Iron Warriors fight Iron Hands at Medusa.	Liber Chaotica: Khorne, Codex: Chaos Space Marines (3rd Edition, 2nd Codex)
circa. 019.M39	Inquisitor Jaq Draco visits Stalinvast. Stalinvast destroyed.	Inquisition War
022.M39	The Liber Secretorum, Jaq Draco's account of his escapades found by the Ordo Malleus; conflict between Ordo Malleus and journeyman Inquisitors begins.	Inquisition War
301.M39	Abaddon's 11th Black Crusade.	Codex: Chaos Space Marines (3rd Edition, 2nd Codex)
433.M39	The Autarch of the planet Krieg declares independence from the Imperium. Colonel Jurten of the Krieg 33rd turns the planet into an atomic wasteland to eliminate the heresy.
645.M39	Jerulas Crusade by the Black Templars under the command of High Marshal Ludoldus. Marine Artificer Simagus discovers the means (STC?) to produce the Land Raider Crusader. Jerulas system conquered by the Imperium. This pattern is quickly adopted by many Space Marine chapters as tales of its effectivness spread.	Codex: Black Templars (4th Edition), page 43
763.M39	Land Raider Crusader pattern formally recognized by the Techpriests of Mars. Mere formality, by this time hundreds of Chapters were using it already.	Codex: Black Templars (4th Edition), page 43
985.M39	Squat civil war. League Thor fights League Grindel over exploration of the lost Stronghold of Dargon. Cyclops invented.	Codex Imperialis
985.M39	Donian Crusade. Black Templars clear the Donian sector of Orks.
998.M39	Unholy Harbringer Space Hulk breaks from warp near Cloras jump point.

M38	Timeline	M40