Green Hills was an outer colony.[1]


Along with Second Base, Green Hills was one of two colonies lost directly after Harvest in 2526. Initially, the UNSC had hoped to cover up their loss by explaining it away as a communications blackout caused by Insurrectionists. Eventually, they revealed that the UNSC was now fighting a xenocidal alien hegemony, and that this and another colony had been destroyed with the total loss of two million civilians between them.[2]


  1. Halo Mythos: A Guide to the Story of Halo - Page 54
  2. Halo Wars: Genesis - Page 5
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