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In 2526, when the Covenant first invaded human space, their forces were primarily in the Polona, Grenadi, and Vevina sectors. Numerous battles that year took place in the Polona sector including the Battle of Biko, Battle of Seoba, Battle of Mesra and the Battle of Netherop.
- Halo: Silent Storm, Chapter 5
- Halo: Silent Storm, Chapter 22
- Twitter: "Etalan and Biko are in the Polona Sector. Netherop probably is, too. The action is fairly compressed, timewise, so they couldn't have been traveling far. Harvest is less certain -- in my mind, it was more distant, so was probably in an adjoining sector 2/"
- Halo: Oblivion, Chapter 4
- Halo: Silent Storm, Chapter 6