The Siege of the Inner Colonies was a series of engagements taking place in humanity's Inner colonies.[2][1]


On June 1st, 2536, the Covenant Empire finally made their way into the Inner Colonies.[1]

Numerous ships were pulled from their positions in the Outer Colonies to defend the Inner Colonies.[3] Old ships, such as the Halcyon-class light cruiser UNSC Pillar of Autumn, were refitted and brought back into service to supplement the remaining defense forces.[4]

Early Battles

One of the earliest battles in the Inner colonies was the Battle of Camber. 5.5 million people were killed in the battle, and the planet was glassed.[5] Actium would fall[6] nearly a decade later, along with Skopje.[7] In a rare moment, the colony of Ballast would come under attack and the UNSC would win.[8]

The Fall of Reach

Main article: Fall of Reach
H2A Cinematic Reach-CovenantEngagingAutumn

The destruction of Reach.

The Fall of Reach was one of the greatest defeats in the Human-Covenant war.

In 2552, the Covenant had discovered Reach.[9][10][11] The Covenant initially landed on the planet with a smaller fleet,[12] but it began to escalate as more and more combatants arrived on either side. Dozens of Inner Colony planets were bypassed by the Covenant Fleet attacking Reach.[13] While Reach would end up being destroyed, a cruiser, the UNSC Pillar of Autumn, would escape the destruction and begin the decisive Battle of Installation 04.[14]

It can be presumed that even more inner Colonies survived, considering the next Covenant attack was Earth.

The Battle of Earth

Main article: Battle of Earth
H2A Cutscene BattleofEarth

The Battle on Earth rages on.

After almost 27 years of war, Earth finally came under attack by the Prophet of Regret in late 2552. Earth's orbit would become the first area to be besieged, before the Prophet would move onto New Mombasa.[15] The Prophet would then use slipspace to fast travel out of New Mombasa[16] and to Installation 05.[17] Other Covenant forces would eventually move onto Ross Island, Havana, Cleveland, and Pawa. When the Keyship carrying the Prophet of Truth and John-117 returned to Earth,[18] his forces would use the crater created by Regret to dig up The Artifact.[19] This artifact would eventually lead to Installation 00[20] and the end of the war.


The loss of many of the inner colonies had a severe impact on the remaining UEG. The loss of Tribute alone would have a severe economic impact.[21] On top of this, the Inner colonies that were hit hard by glassing would take a some time to come back up to full health. Reach wouldn't become habitable until 2589.[22]


June 1, 2536

  • The Inner Colonies is entered by the Covenant.[1]

May 2545

June 2545

  • The Battle of Actium ends.[6]


July 2552

August 2552

  • The Fall of Reach ends with Reach's glassing.[23][24]

October 2552

November 2552

  • The Battle of Earth ends.[26]



  1. 1.0 1.1 1.2 1.3 Halo Wars - Bonus Item: Halo Wars Timeline Events
  2. Halo Storyline (Defunct, Copy on HBO Forums)
  3. Halo: The Fall of Reach, page 190 (Digital)
  4. Halo: The Fall of Reach, page 272 (Digital), 238 (Physical)
  5. 5.0 5.1 Halo 2: Anniversary - Terminal: ONI File: Honor Bound
  6. 6.0 6.1 6.2 Halo Waypoint: Videos - Hero (Courage) (Defunct, Copy on Youtube)
  7. 7.0 7.1 Halo: Evolutions - Essential Tales of the Halo Universe, Dirt, page 313
  8. 8.0 8.1 Halo Encyclopedia, page ??
  9. Halo: The Fall of Reach - Page 251 (2010)
  10. Halo Encyclopedia - Page 208 - The Fall of Reach
  11. 11.0 11.1 Halo: Reach - Level: Winter Contingency
  12. Halo: Reach - Level: Nightfall
  13. Halo: The Fall of Reach, page ??
  14. Halo: Combat Evolved - Level: The Pillar of Autumn
  15. 15.0 15.1 Halo 2 - Level: Cairo Station
  16. Halo 2- Level: Metropolis
  17. Halo 2 - Level: Delta Halo
  18. Halo 2 - Level: The Great Journey
  19. Halo 3: ODST - Level: Coastal Highway
  20. Halo 3 - Level: The Ark
  21. 21.0 21.1 Halo Waypoint: Universe - Locations - Tribute
  22. Halo: Reach - Level: Lone Wolf
  23. Halo 2 - Level: The Heretic
  24. Halo: Reach - Level: The Pillar of Autumn
  25. Halo: Uprising Issue 1
  26. Halo 3 - Level: Floodgate

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