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SSgt Avery Johnson, UNSC Marine Corps.JPG
Staff Sergeant Avery Johnson and members of the colonial militia on Harvest.

26th century

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For a complete list, see our Timeline directory.

2525 was a year in the 2520s in the 26th century. It was a year that saw the start of the Human-Covenant War, which would become a twenty-seven year long engagement between the Covenant Empire and the United Nations Space Command. The war began after first contact between the belligerents at the human Outer Colony of Harvest. The emergence of the Covenant threat prompted the training of the Spartan-II supersoldiers to be accelerated and a group of them were selected for their very first live combat mission in September of this year, an operation to capture the United Rebel Front colonel, Robert Watts.




February 3

February 9

February 11

February 22

February 23

February 28


March 6

March 9

March 25

  • The Spartan-IIs awaken aboard Endurance and Halsey assesses the results.[18] Thirty-three Spartans successfully pass the alterations.[20] Thirty subjects have died,[Note 1] and twelve are permanently disabled.

March 30


April 1

April 20

April 21

  • Mack detects the CMA Argo enter Harvest's orbit. He attempts to warn Argo of the Covenant, but the scout ship is destroyed by Rapid Conversion.[24]

April 22

  • John-117 kills two Marines of the 105th Shock Troops Division and severely wounds another aboard Atlas in an incident secretly engineered by ONI to test the efficiency of the SPARTAN-II augmentations.[25]


May 11

  • Preston Cole's liver fails from cirrhosis, and is subsequently replaced - as are his damaged heart and endocrine system - with flash-cloned transplants.[26]


June 27

  • Dr. Halsey begins to plan therapies, experimental surgeries, and rehabilitations for over eighty percent of the SPARTAN-II augmentation washouts. Some of the protocols are estimated to take years to complete. Artificial intelligences predict a fifty percent success rate, though Halsey believes the Spartans' will to serve the UNSC will boost the success rate.[22]

June 28

June 30

  • The NAVSPECWEP approves the limited-run production of the MJOLNIR Mark IV armor, four months after the prototypes were sent.[22]
  • A test case file was unintentionally "attached" to an official response to Catherine Halsey. The file showed a volunteer attempting to use a prototype of the MJOLNIR Powered Assault Armor, resulting in his death due to his lack of training and proper physiology.[22]


July 1

  • Mack begins burying the MagLev strands of the Tiara as the Covenant begins to glass Harvest.[27]


August 8


September 1

September 11

September 12

September 14


October 7

  • Battle Group 4, composed of the CMA Heracles, the CMA Arabia and the CMA Vostok enters the Epsilon Indi system and make contact with a Covenant ship. The Covenant ship destroys the Vostok and the Arabia with only the badly damaged Heracles escaping.[33]
  • The Covenant ship broadcasts the following message to the battlegroup: "Your destruction is the will of the Gods...and we are their instrument," in complete English, showing that the Covenant have been studying humanity for some time.[34]

October 31

  • FLEETCOM recieves the Covenant's declaration of war.[35]


November 1

  • UNSC is put on full alert for the Covenant. The training of the SPARTAN-IIs is accelerated.[34]
  • The CMA combat forces are immediately placed under the UNSC's NAVCOM/UNICOM for preparation for the upcoming war.[36]

November 2

November 3

  • Dr. Halsey begins to analyze the Covenant.[22]

November 5

  • Many high-ranking personnel within the UNSC begin to show fear of the Covenant. Dr. Halsey and Franklin Mendez discuss the SPARTAN-IIs and Covenant threat.[22]

November 6–27

November 27

  • The Battle of Chi Ceti. The SPARTAN-IIs are delivered to the Damascus Testing Facility on Chi Ceti IV by the UNSC Commonwealth. While en route to the planet, Commonwealth is attacked by the Covenant's Unrelenting. The Commonwealth manages to damage Unrelenting, allowing the Spartans to escape to Chi Ceti IV.[40]
  • Within the UNSC Damascus Materials Testing Facility, the SPARTAN-IIs are introduced and fitted with the MJOLNIR Powered Assault Armor/Mark IV.[41]
  • While the Spartans are returning to the Commonwealth, Unrelenting returns and attacks the frigate. The SPARTAN-IIs board the Covenant ship. They plant Anvil-II air-to-surface missiles at the ship's reactor and detonate them, destroying the ship—resulting in the death of Samuel-034.[42]


December 1

December 3

  • The UNSC colony Alpha Corvi II is attacked by the Covenant; a large ground force assaults Jamshid, the largest settlement on the planet. Despite having inflicted heavy casualties, an alliance forged by the UNSC and United Rebel Front fails to halt the Covenant invasion, forcing the UNSC to abandon the colony.

Unknown date[edit]


  1. ^ In Halo: The Fall of Reach - The Animated Series, Déjà states that 27 subjects died, 36% of the candidates.


  1. ^ Halo: Contact Harvest, page 105
  2. ^ Halo: Contact Harvest, pages 105-123
  3. ^ Halo: Contact Harvest, pages 124-136
  4. ^ Halo: Contact Harvest, page 137
  5. ^ Halo: Contact Harvest, page 143
  6. ^ Halo: Contact Harvest, pages 143-158
  7. ^ Halo: Contact Harvest, page 166
  8. ^ Halo: Contact Harvest, pages 159-166
  9. ^ Halo Waypoint - Universe: Rookie
  10. ^ Halo: Contact Harvest, pages 256-259
  11. ^ Halo: Contact Harvest, page 391
  12. ^ Halo: Contact Harvest, pages 279-286
  13. ^ Halo: Contact Harvest, pages 335-336
  14. ^ Halo: Contact Harvest, pages 368-385
  15. ^ Halo: Reach Limited Edition, Intersystem News, LCDR Miranda Keyes Awarded Silver Star
  16. ^ Halo: Ghosts of Onyx, page 127
  17. ^ Halo: The Fall of Reach, pages 55-59 (2001 version); pages 73-77 (2010 version)
  18. ^ a b Halo: The Fall of Reach - The Animated Series
  19. ^ Halo: Fall of Reach (hardcover), chapter Bootcamp 2
  20. ^ Halo Waypoint: Spartans ("Only 33 of the candidates survived without significant injury.")
  21. ^ Halo: The Fall of Reach, pages 60-63
  22. ^ a b c d e f g h Halo: Reach, Dr. Halsey's personal journal
  23. ^ Halo: The Fall of Reach, page 118 (2010 edition)
  24. ^ Halo: Contact Harvest, page 393
  25. ^ Halo: The Fall of Reach, pages 63-69
  26. ^ Halo: Evolutions - Essential Tales of the Halo Universe, "The Impossible Life and the Possible Death of Preston J. Cole", page 459
  27. ^ Halo: Contact Harvest, page 395
  28. ^ Twitter - BSAngel: TodayInHalo 8/8/2525
  29. ^ Halo: The Fall of Reach, pages 69-74
  30. ^ Halo: The Fall of Reach, pages 75-81
  31. ^ Halo: The Fall of Reach, page 77
  32. ^ Halo: The Fall of Reach, pages 81-94
  33. ^ Halo Wars: Genesis
  34. ^ a b Halo: The Fall of Reach, page 98
  35. ^ Halo: Silent Storm, chapter 2
  36. ^ Halo Wars, Timeline
  37. ^ Halo: Evolutions - Essential Tales of the Halo Universe, "The Impossible Life and the Possible Death of Preston J. Cole", page 460
  38. ^ Halo: The Fall of Reach, pages 94-101
  39. ^ Halo: The Fall of Reach, page 125 (2010 edition)
  40. ^ Halo: The Fall of Reach, pages 102-113
  41. ^ Halo: The Fall of Reach, pages 113-119
  42. ^ Halo: The Fall of Reach, pages 119-130
  43. ^ Halo: Contact Harvest, pages 379-384
  44. ^ Halo: The Flood, page 134 (2003 edition)
  45. ^ Halo: Reach, Data pad
  46. ^ Halo: Reach, Data pad 9