106,445 BCE
From Halopedia, the Halo wiki
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Circa 106,445 BCE, the final battles of the human-Forerunner wars are fought, concluding in the humans' standoff at Charum Hakkor.[1] Stretched thin due to fighting two wars simultaneously, humanity loses the war and the Forerunners eliminate all traces of humanity's former interstellar civilization. The Librarian moves the surviving humans to their homeworld, Erde-Tyrene, and establishes a research station there. With their civilization and technology dismantled, humanity regresses to tribal hunter-gatherers for nearly nine thousand years, eventually developing primitive civilization.[2]
