106,445 BCE
From Halopedia, the Halo wiki
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40 years before their final defeat, human colonists arriving at a ravaged planet on the edge of the Milky Way Galaxy discovers an exceedingly ancient stasis capsule. This capsule is the prison of the ancient Precursor and Gravemind known as The Timeless One. Yprin Yprikushma transports the capsule and its prisoner to Charum Hakkor for further study.[1]
Eventually, humanity discovers a way to fight the Flood and contains the infection while it is still relatively minor, removing all traces of its existence within the Milky Way Galaxy. Throughout the war, most Forerunners remain unaware of the Flood's existence, believing stories of the parasite to be an excuse for humanity's aggressive expansion. The Flood will not seen again for ten millenia.[2]
In approximately 109,000 BCE, the final battles of the Human-Forerunner war are fought, concluding in the humans' standoff at Charum Hakkor.[3] 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.[4]
