Siege of the Inner Colonies

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Massacre of the Outer Colonies


Meridian, Arcadia (II), New Jerusalem, Installation 04, Installation 05


Installation 00

Siege of the Inner Colonies
Fall of Reach 1.jpg
Reach falls in 2552


Human-Covenant War


June 1, 2536[1] - circa December 3, 2552[Note 1][2]


Inner colonies, Orion Arm, Milky Way galaxy


Pyrrhic UNSC-Sangheili Victory

  • Discovery of Halo Array
  • Loss of a number of the inner colonies, including Reach
  • Billions of civilian and miltary casualties




Incredibly devastating losses

Moderate Sangheili casualties

Heavy losses


The Siege of the Inner Colonies[1] was the series of engagements taking place in humanity's Inner colonies that made up the late Human-Covenant War[3][Note 3] and roughly corresponds to the time between the implementation of the Cole Protocol and the end of the war.[4]

There would be a handful of human victories through the Siege, though they were only minor setbacks for the Covenant.[5] Typically these victories were won in costly ground campaigns, with space combat still largely in the Covenant's favor.[1][3] Although the pace of destruction did not match the Massacre of the Outer Colonies,[4] colonies still fell one-by-one.[1][3] Propaganda and willful ignorance kept the innermost colonies detached from the actual horrors going on.[5]


Outer Colony slaughters[edit]

Main article: Massacre of the Outer Colonies

Following the loss of the Outer Colonies, the UEG gave new emergency powers to the UNSC and martial law was declared in numerous areas.[6]


From June 1, 2536, onwards, the Covenant would press into the Inner Colonies.[1]

Eight years afterward, the Inner Colony of Miridem would fall to the Covenant.[7] This would eventually result in the capture of Catherine Halsey.[8] In May 2545, Actium was discovered by the Covenant, resulting in the month long Battle of Actium.[9]

In May of 2552,[Note 4] the colonies of Troy and Harmony in the Hellespont system were attacked.

Attacks in the Epsilon Eridani system[edit]

Main articles: Fall of Reach, Battle for Tribute

On July 23, 2552, the Fleet of Valiant Prudence deployed Sangheili Zealots to disable the Visegrád Relay, effectively cutting Reach off from the UNSC.[10]

By August 30, 2552, nearly a dozen Inner Colony worlds were passed over by the Covenant in order to attack Reach.[11]

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Fighting in the Sol System[edit]

Main articles: Battle of Mare Erythraeum, Battle for Earth
Help.png This section needs expansion. You can help Halopedia by expanding it.


A number of Inner Colonies managed to survive the war.[12][13]

The Lesser Ark[edit]

Main article: Battle of Installation 00

The joint UNSC and Sangheili forces were deployed to the Ark after discovering the portal.[14]

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  • January 10, 2545: The Covenant arrive in the Draco system and quickly destroy the UNSC defenses surrounding Draco III. However instead of using their typical tactic of glassing all major settlements, the Covenant spare some of the cities of Draco III from destruction for use as a hunting ground to feed their starving Unggoy and Kig-Yar populations.[17][18] Spartan-IIs retaliate by killing every Covenant remaining on the planet, at the expense of being unable to save any civilians.
  • May: A month long campaign on Actium takes place between the Covenant and UNSC. The UNSC is defeated and the planet is eventually glassed by the Covenant, but not before the UNSC forces destroy three of the largest Covenant staging areas on record.[19]
  • July 3, 2545: Operation: TORPEDO is undertaken by UNSC Spartan-IIIs to eliminate a Covenant fuel refinery. The refinery is destroyed, at the cost of all but two of the 300 Spartan-IIIs.[20]











  1. ^ While no official date has been given to the end of the Battle for Earth, the currently last known engagement during the battle, the Operation: MARSH FLASH in Arizona, took place on December 3, although it's still possible that other engagements on some other countries or continents was still occuring after the URNA Southwest Campaign ended.
  2. ^ a b c d e Part of the Home Fleet after Sept. 5, 2552
  3. ^ Due to the name, and the stated scope of the Siege, Halopedia assumes all of the Inner Colonies attacked after June 1, 2536 fall within this overarching battle.
  4. ^ a b The last i love bees Axon chapter contains the start of the Covenant invasion of Earth, a set date, and each chapter is set a week apart. In the first chapter, axon receipt, Herzog refers to the evacuation as "three months" ago.


  1. ^ a b c d e Halo Wars, collectible, Halo Wars Timeline Events
  2. ^ Halo Legendary Crate, Naval Records Archives 1
  3. ^ a b c, Halo Storyline: (Additional copy on HBO Forums) (Retrieved on Apr 24, 2008) [local archive] [external archive]
  4. ^ a b Halo Mythos, page 80-81
  5. ^ a b Halo Mythos, page 82-83
  6. ^ Halo Encyclopedia (2022 edition), page 52
  7. ^ a b Halo Encyclopedia (2009 edition), p. 299 (2011)
  8. ^ Halo: The Fall of Reach, Adjunct (2010)
  9. ^ Halo Waypoint, Heroes Never Die
  10. ^ a b Halo: Reach, campaign levels, Noble Actual and Winter Contingency
  11. ^ Halo: The Fall of Reach, chapter 32: "I see. Very well, your squad might as well hear this now, too. I don’t know how they found Reach—they bypassed a dozen Inner Colony worlds to get here."
  12. ^ Halo: First Strike (2010), Adjunct: Petra
  13. ^ Halo: Mortal Dictata, p. 481
  14. ^ Halo 3, campaign level The Ark
  15. ^ Halo: The Fall of Reach, Adjunct (2010)
  16. ^ Halo Legends: The Package
  17. ^ Halo: The Essential Visual Guide, page 26
  18. ^ Halo: New Blood, pages 19-20 (Google Play edition)
  19. ^ Halo Waypoint, Hero - Courage (Defunct)
  20. ^ Halo: Ghosts of Onyx, page 25-26
  21. ^ Halo Encyclopedia (2022 edition), page 50
  22. ^ Halo: Glasslands, page 133
  23. ^ Jessica Shea's Twitter: Today in Halo - 9/21/2546
  24. ^ Halo: The Essential Visual Guide, page 184
  25. ^ Halo: Evolutions - Essential Tales of the Halo Universe, "Dirt", p. 171-172
  26. ^ Halo 5: Guardians, campaign level Glassed
  27. ^ a b Halo Encyclopedia (2022 edition), page 50
  28. ^ Halo Encyclopedia (2011 edition), page 37
  29. ^ Halo Wars, Timeline Events
  30. ^ Halo: Escalation, issue #17
  31. ^ Halo 4, Venator armor description
  32. ^ Halo: Helljumper, Issue 1
  33. ^ Halo: Helljumper, Issue 2
  34. ^ Halo: The Essential Visual Guide, p. 105
  35. ^ Halo: The Fall of Reach, page 170
  36. ^ Halo: Uprising, Issue #3
  37. ^ Halo 5: Guardians Limited Edition - Kelly-087's profile card
  38. ^ Halo Encyclopedia (2009 edition), p. 300 (2011)