The UNSC fleet in the XI Boötis A system, firing a volley of MAC rounds at the invading Covenant fleet, February 13th, 2528. (Halo Wars: Genesis)
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The Battle of XI Boötis A was a naval battle during the early portions of the Human-Covenant War. The battle featured seventy UNSC warships versus eight Covenant. In the end, the battle was a victory for the UNSC, but it came at the cost of thirty UNSC ships, nearly half the fleet.
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These events are referenced in the comic Halo Wars: Genesis.