The date 100,000. B.C.E was the approximate time when the Forerunners fired the Halos. To the Covenant, this is known as The Great Journey.
343 Guilty Spark put the date as the year 97,448 B.C.E, though it should be noted that he measured it on Installation 04's year, not the 365.251 day Earth calendar.
The activation was to end the Forerunner-Flood War. It killed all sentient life within three radii of the galactic center, including any Forerunners not located on The Ark or within Shield Worlds.
343 Guilty Spark put the date as the year 97,448 B.C.E, though it should be noted that he measured it on Installation 04's year, not the 365.251 day Earth calendar.
The activation was to end the Forerunner-Flood War. It killed all sentient life within three radii of the galactic center, including any Forerunners not located on The Ark or within Shield Worlds.