Battle of Netherop
From Halopedia, the Halo wiki
The Battle of Netherop was a battle that occurred when Blue Team attempted to capture a downed Covenant frigate on the planet Netherop. However, it was also a trap by rogue Fleetmaster Nizat 'Kvarosee which turns into a three-way conflict with forces from the Covenant, particularly the Silent Shadow.
In the waxing months of the Human-Covenant War, and weeks after the overwhelmingly successful Operation: SILENT STORM, humanity's best chance for survival is a disable Covenant frigate filled with valuable technology that could help them win the war. It rests on an inhospitable world and offered to the UNSC by the same disgraced Covenant fleetmaster who failed to stop the SPARTAN-IIs in Operation: SILENT STORM.
The objective of the Operation was to retrieve a previously captured covenant vessel called "the lucky break".
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