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Outer Colonies

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The Outer Colonies are the human-colonized planets farthest from the Inner colonies such as Earth and Reach, with colonies founded after. Until the Human-Covenant war, disorder and rebellion were commonplace. By 2536, the majority of the Outer Colonies had been glassed by the Covenant.[1]


The Insurrection

Main article: Insurrection

As humanity expanded, the outer colonies began to experience sentiments of autonomy and political independence from the UEG.[2] By the 2400s, the impotence by the UEG to keep the outer colonies felt to many colonists like an interference on a confederation of independent planets.[3] This began to cause a tremendous amount of stress across human controlled space. In 2492, this stress eventually caused many riots on the colony of Far Isle. With the UNSC unable to control it, they used nuclear weapons to put down the riots and declared Code Bandersnatch.[4] This event has been cited as what sparked the Insurrection.[5]

Human-Covenant war

Main article: Human-Covenant war

Harvest post glassing.

The Covenant had found Harvest in 2525. After making a disastrous first contact and fighting two battles, a protracted five-year campaign began on the planet. However, at that point, the Covenant's genocidal judgement of humanity had spread to many of the other outer colonies like Biko and Green Hills. ONI, however, kept this fact a secret from the rest of the public up until 2526.[6]

In 2536, after ten years of war, most of the Outer Colonies had been lost, and the inner colonies were beginning to be attacked.[1] Jericho VII was among the last major ones to fall.

By 2552, though some Outer Colonies still remained in UNSC hands (mostly remote outposts), most were small and rather insignificant worlds.[7] The few significant colonies still under UNSC control lived in constant fear of Covenant invasion. Some of the remaining colonies were bases for outlaws.


By the time the Human-Covenant war ended on March 3, 2553, tensions in the remaining worlds had presumably died down enough for the UEG.

H5G HTT-EP9 Outbreak

The escalated riots in the outer colonies.

In 2558, after the revelation that John-117 had attacked a peace delegation on Biko, and that ONI abducted children from the outer colonies for the SPARTAN-II program, huge parts of the outer colonies had again started to distrust the UEG. Many turned to the New Colonial Alliance instead.[8]

Following Benjamin Giraud's interruption of a joint UEG Senate and ONI meeting, the Waypoint buoys connecting the inner and outer colonies were shut down.[8] When Benjamin was publicly discredited on ECB, tensions died down and the buoys were turned back on.[9]

Known Colonies

Unknown System



  1. 1.0 1.1 Halo Storyline (Defunct, Copy on HBO Forums)
  2. Halo Encyclopedia, page 45
  3. Halo Encyclopedia, page 43
  4. Halo: Ghosts of Onyx, page 183
  5. Halo Encyclopedia, page 288
  6. Halo 4: Forward Unto Dawn
  7. Halo: First Strike, pages 98-99: And what did the citizens of the Outer Colonies think? Those who hadn't fled to remote outposts and hidden privateer bases weren't in any position to make trouble. The Covenant didn't take prisoners.
  8. 8.0 8.1 Hunt the Truth - Episode 09: Phantoms (Part 1)/(Part 2)
  9. Hunt the Truth - Episode 13: In The Bag (Part 1)/(Part 2)
  10. Halo: Escalation Issue 17

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