what happened to the pillar of autumn
About 2500. The Pillar of Autumn was prepped for a mission to enter covenant space and seize a prophet. They packed as many troops onto the Autumn as possibly for this risky mâ¦ission. Unfortunately, before they could get their mission underway, they were re-assigned to defend planet Reach, and ended up at Halo. The majority of the Pillar of Autumn's crew were infected by the Flood and then killed by the Master Chief.