From Halopedia, the Halo wiki
2526 was a year in the 2520s in the 26th century.
- At 0930 hours, Chris Preston, undergoing medical rehabilitation on board a refit station, records a message for David Dominguez's parents recounting his sacrifice in securing Kig-Yar point defense gauntlets during the evacuation of Harvest.
- Between 0153 and 0314 hours; while surveying the outer colony planet Bliss, the UNSC Accra encountered a Covenant ships before being destroyed, starting the Battle of Bliss, and the glassing of the planet.
- Following it's recovery by the UNSC Prophecy, the Accras voyage data recorder is accessed and the final event logs are made into a document called the "The Accra Incident".
- Doctor Catherine Halsey makes an entry in her personal journal in which she ponders the nature of the Covenant and the relationships between its client species.
- Preston Cole's Battle Group X-Ray reaches Harvest and the Second Battle of Harvest begins, achieving a Pyrrhic victory. However, the Covenant also claim victory and celebrate through fasting and prayer. The Prophet of Regret broadcasts the executions of "those who failed their duty" in the battle. The Covenant return to Harvest later in the year, leading to a five-year campaign for control of the planet.
- The Razor-class prowler UNSC Starry Night covertly observes the frigate Radiant Arrow and its complement of Elsedda-pattern Banshees at the planet Netherop.
- Twelve Spartan-IIs of Blue, Green, and Gold Teams infiltrate the Radiant Arrow in high equatorial orbit over Netherop. The frigate is intentionally scuttled by its shipmaster but all Spartans make it off in time.
- Staff Sergeant Avery Johnson meets with Admirals Preston Cole and Michael Stanforth and Doctor Catherine Halsey aboard the UNSC Everest and agrees to be recruited for Operation: SILENT STORM.
- The particulars of Operation: SILENT STORM are formalized aboard the Point Blank-class prowler UNSC Vanishing Point.
- UNSC forces working with ONI agents prevent an attack on New Harmony, Mars. Two Insurrectionists, Christina Rice and James McCann, were disguised as Army specialists and were stealing weapons for a possible attack.
- The Battle of Circinius IV takes place: the Covenant launch an assault on Circinius IV, killing almost the entire human population of the planet. SPARTAN-II Blue Team is deployed to retrieve survivors from Corbulo Academy of Military Science; only four cadets from Hastati Squad remain alive after the initial assault, three of whom make it to the extraction point and evacuate as the planet is glassed.
- Vice Admiral Michael Stanforth requested for the Office of Naval Intelligence to repurpose all assets to aid the war against the Covenant and to refocus all research on wartime strategy.
- Dr. Catherine Halsey devises a new matrix strata with random-access couplers that could theoretically expand an AI's lifespan. Those protocols are authorized by Vice Admiral Michael Stanforth some time later.
- The Battle of Mesra takes place as the Covenant invade the Outer colony of Mesra in the Qusdar system with the intent of capturing its vast mining infrastructure; Admiral Preston Cole launches a counteroffensive in a bid to wipe out the invaders, led by Spartan Blue Team.
- By June, FLEETCOM is unable to consolidate battlefield intelligence before it became inactionable, and stops trying to coordinate core strategy, granting operational autonomy to each battle group.
- Biko is glassed by the Covenant.
- The Committee of Minds for Security analyze the Covenant's glassing capabilities based on recorded data from prior engagements. They also discuss changing the primary focus of the UNSC Special Forces, with the protection of infrastructure, previously the main focus of the Spartan-IIs, being shifted to the ODST. Later in the year the Committee discuss the possibility of a hypothetical Covenant counterpart to the Assembly and the possibility of contacting it.
- The Type-32 Rapid Assault Vehicle is first observed by the UNSC.
- Become - UNSC Archives: Unspoken
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: "The Accra Incident"
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: Intersystem News "Bliss Decimated"
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: February 24, 2526
- Halo: Silent Storm, Chapter 1
- Halo: Silent Storm, Chapter 3
- Halo: Silent Storm, Chapter 9
- Halo: Silent Storm, Chapter 4
- Halo: Silent Storm, Chapter 5
- Halo.Bungie.Net - Project, Halo: Reach, Intel, CAA Factbook, Operational Reports-Γ (Retrieved on Oct 25, 2020) [archive]
- Halo 4: Forward Unto Dawn, Part 1
- Halo Encyclopedia (2022 edition), page 457
- Halo 4: Forward Unto Dawn
- Twitter, Halo (@Halo): "#TodayInHalo 04/26/2526 - Circinius-IV is attacked by the Covenant, forcing the evacuation of the planet." (Retrieved on Apr 27, 2013) [archive]
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: April 28, 2526
- Halo: Reach: Limited Edition, Dr. Halsey's personal journal: May 3, 2526
- Halo: Oblivion - Chapter 1
- Halo: Reach, Data pad 10
- Halo: Reach, Data pad 11
- Halo: Reach, Data pad 12
- Halo Waypoint - Universe, Weapons, Shade Turret (Retrieved on Jan 4, 2020) [local archive] [external archive]