The Ullanor Crusade was Horus's greatest victory before the Heresy. Learn how he broke the Ork empire and earned the title Warmaster.
History
The 40k timeline: the War in Heaven, the Great Crusade, the Horus Heresy, and the wars that followed.
115 entries in this section
Start here
The pages most readers open first in this section.
The Horus Heresy
The Horus Heresy is the civil war that broke the Imperium 10,000 years before Warhammer 40k. Here's what happened, who fought, and why it still matters.
The Great Crusade
The Great Crusade was the Emperor's campaign to reunite humanity and build the Imperium. Here's what it was, how it ended, and why it matters in 40k.
The Age of Strife
The Age of Strife, or Old Night, was humanity's darkest era before the Imperium. Learn what caused it, how it ended, and why it still matters in 40k.
The Dark Age of Technology
The Dark Age of Technology was humanity's golden age of science and warp travel. Here's what happened, when it ended, and why it still matters in 40k.
The Siege of Terra
The Siege of Terra was the Horus Heresy's final battle. Learn why it matters, who fought, and how it shaped Warhammer 40k forever.
The Indomitus Crusade
The Indomitus Crusade is Roboute Guilliman's grand reconquest after the Great Rift. Learn its history, fleets, leaders, and why it reshaped the Imperium.
All 115 entries
Every page in this section, A to Z. Titles starting with "The" are filed by the next word.
B
- The Badab War
- The Badab War's Aftermath
- The Battle of Calth
- The Battle of Istvaan III
- The Battle of Istvaan V
- The Battle of Phall
- The Battle of Pluto
- The Battle of Prospero
- The Battle of Ryza
- The Battle of Sotha
- The Battle of Terra's Orbit
- The Battle of the Alaxxes Nebula
- The Battle of the Eternity Gate
- The Battle of Titan
- The Battle of Yarant
- The Beheading
- The Betrayal at Calth
- The Black Crusades
- The Burning of Prospero
C
E
F
I
N
S
- The Sabbat Worlds Crusade
- The Scouring
- The Scouring of Terra's Orbit
- The Second Black Crusade
- The Second Founding Era
- The Second Tyrannic War
- The Second War for Armageddon
- The Seventh Black Crusade
- The Shadow Crusade
- The Siege of Terra
- The Siege of the Imperial Palace
- Siege of Vraks
- The Sixth Black Crusade
- Solar War
T
- The Taros Campaign
- The Tenth Black Crusade
- Terran Crusade
- The Terran Unification
- The Third Black Crusade
- The Third Tyrannic War
- The Third War for Armageddon
- Thirteenth Black Crusade
- The Thramas Crusade
- The Thunder Warriors
- The Time of Ending
- The Treaty of Mars
- Treaty of Olympus
- The Triumph of Ullanor
- The Twelfth Black Crusade
- Tyrannic Wars
W
Recently added
The newest entries in this section.
The Tyrannic Wars are the Imperium's long war against the Tyranid hive fleets, from Behemoth to Leviathan. Here's the history, battle by battle.
The Treaty of Olympus bound Mars to the Emperor in 739.M30, trading Mechanicum industry for autonomy, and shaped the Imperium's war machine.
The Thirteenth Black Crusade shattered the Cadian Gate in 999.M41. Learn how Abaddon's Crimson Path broke Cadia and tore the galaxy open.
The Terran Crusade was Roboute Guilliman's desperate dash from Ultramar to Terra after Cadia fell. Here's how the campaign unfolded.
The Solar War was the Horus Heresy's opening battle for the Sol System. Learn how Horus broke Terra's defences and why it mattered.
The Siege of Vraks was a 17-year Imperial campaign to retake a Chaos-held armoury world. Learn the key battles, commanders, and brutal cost.
The Noctis Aeterna was the galaxy-wide darkness after the Great Rift opened. Here's what it did to the Imperium, and how it ended.
Old Night, or the Age of Strife, was humanity's brutal collapse after the Dark Age of Technology. Here's what happened and why it matters.