11A2R1 naval coilgun battery
In 2520, the Phoenix-class colony ship UNSC Spirit of Fire was outfitted with ten such weapons. During the Human-Covenant War in 2531, these weapons were often used to provide orbital fire support for the ship's crew.[note 1] During the Battle of the Etran Harborage, these cannons were used to defend against a Covenant CPV-class heavy destroyer, as well as numerous Spirit dropships and their Banshee escorts, while the ship's Marine and Spartan complement fended off boarders and repaired the drive core.
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