From Halopedia, the Halo wiki
In 2558, while Forest was attempting to acquire the replacement power supply for the Harvester their Pelican was shot down at the Apex. Fireteam Crimson soon arrived and they joined up to complete the mission. After boarding the Lich and skillfully procuring the power core, Verrat made an unforeseen move and drove the Warthog while in the Lich's entry bay off the ship.
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