From Halopedia, the Halo wiki
During the Installation 07 conflict, Spartan Rosado and fellow Spartan M. Jaide detected signal spikes from a Banished outpost known as the Annex Ridge. Upon closer inspection from the outpost's perimeter, Jaide found ring-shaped Forerunner artifacts being studied in the outpost before being transported away. At Rosado's suggestion to find out the Banished's intentions with these artifacts, the two Spartans hijacked one of the siege-haulers, which carried at least three such artifacts. Jaide left a transmission reporting that the siege-hauler's autopilot system was taking the transport to an unknown destination, though they likely managed to escape with the siege-hauler, as the same transport was later reported as lost by the Banished commander Zeretus.
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