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


Main article: Outer Colony Massacres
This section requires expansion.


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] Nearly a decade later, Miridem would come under attack leading to the capture of Dr. Catherine Halsey.[6] Actium would fall[7] with Skopje[8] at about the same time. The Covenant had also started infesting the space between the Luyten 726-8 system and the Sol system.[9] In a rare moment, the colony of Ballast would come under attack and the UNSC would win the battle.[10]

The Fall of Reach

Main article: Fall of Reach
“We knew this day would come. They have found our fortress among the stars.”
— Catherine Halsey[11]
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.[12][13][14] The Covenant initially landed on the planet with a smaller fleet,[15] 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.[16] 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.[17]

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


Main article: Operation: FIRST STRIKE

The Covenant had discovered Earth, and began preparing their forces in the nearby system of Tau Ceti. The Prophet of Truth had put together forces mostly comprised of Jiralhanae.[18] These forces would be destroyed, sparing Earth of a large invasion.[19]

The Battle of Earth

Main article: Battle of Earth
“ all we have left.”
H2A Cutscene BattleofEarth

The Battle on Earth rages on.

After almost 27 years of war and the effort of most of humanity, 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.[21] The Prophet would then use slipspace to fast travel out of New Mombasa[22] and to Installation 05.[23] 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,[24] his forces would use the crater created by Regret to dig up The Artifact.[25] This artifact would eventually lead to Installation 00[26] 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 on human space.[27] 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.[28]



June 1

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





  • The Battle of Actium ends.[7]





  • The Fall of Reach ends with Reach's glassing.[29][30]




  • The Battle of Earth ends.[33]



  1. 1.0 1.1 1.2 1.3 Halo Wars - Collectible: 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 Halo: Ghosts of Onyx - Chapter 20: Page 173
  7. 7.0 7.1 7.2 Halo Waypoint: Videos - Hero (Courage) (Defunct, Copy on Youtube)
  8. 8.0 8.1 Halo: Evolutions - Essential Tales of the Halo Universe - Dirt: Page 313
  9. Halo Waypoint: Universe - Characters - Olympia Vale
  10. 10.0 10.1 Halo Encyclopedia - Page ??
  11. Halo: Reach - ViDoc: A Spartan Will Rise
  12. Halo: The Fall of Reach - Page 251 (2010)
  13. Halo Encyclopedia - Page 208 - The Fall of Reach
  14. 14.0 14.1 Halo: Reach - Level: Winter Contingency
  15. Halo: Reach - Level: Nightfall
  16. Halo: The Fall of Reach, page ??
  17. Halo: Combat Evolved - Level: The Pillar of Autumn
  18. Halo Waypoint - Ten Twenty
  19. Halo: First Strike - Pages 328-333
  20. Halo 3 - Level: Floodgate
  21. 21.0 21.1 Halo 2 - Level: Cairo Station
  22. Halo 2- Level: Metropolis
  23. Halo 2 - Level: Delta Halo
  24. Halo 2 - Level: The Great Journey
  25. Halo 3: ODST - Level: Coastal Highway
  26. Halo 3 - Level: The Ark
  27. 27.0 27.1 Halo Waypoint: Universe - Locations - Tribute
  28. Halo: Reach - Level: Lone Wolf
  29. Halo 2 - Level: The Heretic
  30. Halo: Reach - Level: The Pillar of Autumn
  31. Halo: First Strike - Chapters 33-35
  32. Halo: Uprising Issue 1
  33. Halo 3 - Level: Floodgate

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