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Harmony was a human colony located among the Inner Colonies. The planet was glassed by the Covenant in 2552. It is unrelated to New Harmony, another human colony.[1]


Human-Covenant War[edit]

Main article: Human-Covenant War

In February 2552, insurrectionists on Harmony disabled the planet's primary communication relay and stole two freighters from a drydock.[2]

Several months later, Colonel Herzog suspected the Office of Naval Intelligence had broken the code used by the Covenant and learned of the upcoming attack but let Harmony fall, along with Troy, to ensure the Covenant would not realize their code was cracked.[3] It was implied he was right, saving countless lives in the long run.

List of appearances[edit]


  1. ^ Halo Encyclopedia, page 300 (2011 edition)
  2. ^ Halo: Reach, campaign level, Noble Actual
  3. ^ Axons english_longbow/calculus