Master Chief sometime in 2526. (Halo: Oblivion/cover art/recolored)
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The Battle of Netherop was a conflict between UNSC forces led by Spartan-II Blue Team and Covenant forces on the uninhabited hothouse world in June 2526. The battle was spurred by UNSC's desire to recover a downed Covenant frigate on the planet, though that turned out to be a trap set by Fleetmaster Nizat 'Kvarosee. The mission was not successful, though most UNSC forces were able to evacuate the planet before the Covenant gained total orbital superiority.
Related Media
These events are depicted in the novel Halo: Oblivion.