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Inner colonies

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The Inner Colonies, sometimes referred to as the Core Worlds,[1][2] were the first worlds terraformed and colonized by the Unified Earth Government and the United Nations Space Command, relieving the overpopulation pressure on Earth that resulted in the Interplanetary War.


The Inner Colony Wars

Main article: Inner Colony Wars

It is known that there was a war some time before the 26th century called the "Inner Colony Wars".[3] Very little is known about it and it might just be an alternate name of the Interplanetary Wars, though the name would be of a post-Outer Colonies age, and probably only referring to the Sol system colonies.

Continuing Development

Halo 4 Majestic Map Pack Casbah 2

Casbah, the capital of the commercial powerhouse, Tribute.

The Inner Colonies consisted of the 210 planets which were colonized before 2390. In 2490, Reach, which was located near the boundary of the Inner and Outer Colonies, became the UNSC's military center. As the UNSC began settling the Outer Colonies, the Inner Colonies, with their established social and economic infrastructures, became the political and economic basis of the UNSC, supplied with raw materials from the newer settlements.[4]

The Insurrection

Main article: Insurrection

While the outer colonies held the brunt of the Insurrection, the inner colonies were not spared violence. Tribute became part of Operation: TREBUCHET[5] and Reach was the site of an attack on a luxury liner.[6]

The Human-Covenant war

Main article: Human-Covenant war

The war with the Covenant would take years to reach the inner colonies, mostly due in part to the Cole Protocol which was designed with the protection of Earth and the inner colonies in mind.[7]

As the Covenant rampaged through the outer colonies, refugees poured into the border system of Ectanus 45.[8] In 2536 the Covenant breached into the inner colonies,[4] despite the utmost diligence to the Cole Protocol.

Numerous ships were pulled from their positions in the Outer Colonies to defend the Inner Colonies. 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.[citation needed]

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.


This section requires expansion.

Known Colonies

Unknown system



  1. Halo: Contact Harvest, page 33
  2. Halo Wars: Genesis
  3. Halo Graphic Novel, Second Sunrise over New Mombasa
  4. 4.0 4.1 Halo Storyline (Defunct, Copy on HBO Forums)
  5. Halo: Contact Harvest, pages 9-20
  6. Halo: Contact Harvest, page 127
  7. Halo: The Fall of Reach, page 135
  8. Halo: The Cole Protocol, page 25
  9. Halo: The Fall of Reach 2010 Edition, page 251
  10. Halo Encyclopedia - Page 208 - The Fall of Reach
  11. 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. 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

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