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 * Sheila-065 is killed by Thel 'Lodamee in the Battle of Miridem. Dr. Catherine Halsey is captured by Covenant forces who attempt to flee the system, prompting the ONI to deploy a team of SPARTANs on a rescue mission.
 * After two years of battle against the Covenant, Alluvion's citizens have either died or fled. The colony is abandoned.