106,498 BCE
From Halopedia, the Halo wiki
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Circa 109,050 BCE,[1] the final conflict in the human-Forerunner wars begins. The Forerunner Warrior-Servants, led by the Didact, push humanity back to the Charum Hakkor system, the core of their interstellar empire, which is then effectively cut off from available reinforcements of both humans and their San 'Shyuum allies. For the next fifty years, humanity holds off attacks by the Forerunner fleets,[1] until their defenses eventually fail after three final years of repelling assaults on the system in a constant stream.[2]
