The UNSC Spirit of Fire arriving at Arcadia, February 9th, 2531. (Halo Wars)
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The Battle for Arcadia was a battle for the colony Arcadia in the Procyon system, which occurred in the immediate aftermath of the Harvest Campaign. While the battle resulted in a UNSC victory and a repelling of the Covenant forces, two UNSC ships, the Belfast and the Texas, were destroyed, and professor Ellen Anders, stationed aboard the UNSC Spirit of Fire, was captured. The colony was left mostly abandoned as the Covenant had located Arcadia, though it remained an inhabited colony until its eventual glassing in 2549.
Related Media
These events are depicted in the video game Halo Wars, and the comic Halo: Escalation - Issue #5.