Master Chief sometime in 2526. (Halo: Oblivion/cover art)

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The Battle of Mesra was a Covenant attack on the human outer colony world of Mesra in late May to early June 2526. The battle lasted eight days, and while Spartan-II Blue Team was dispatched to help defend the colony, it was quickly lost to Covenant forces.

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These events are depicted in the novel Halo: Oblivion.