The UNSC and Covenant fleets face off during the Battle of Alpha Corvi II, December 3rd, 2525. (Halo Mythos)
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The Battle of Alpha Corvi II was a battle between the UNSC and the Covenant forces in the Alpha Corvi system on December 3rd, 2525. The battle began when a Covenant fleet arrived in the system and attacked the human colony Alpha Corvi II, fighting both the UNSC fleet in the system and sending troops ground-side to fight UNSC and insurrectionist forces. Spartan-II Blue Team was sent to help the ground battle, and while they were successful, the battle resulted in a Covenant victory.
Related Media
These events are depicted in the comic Halo: Collateral Damage.