
The Sigmaverse is an Expanded Universe project created by Brodie-001.
Covering a number of plots over many decades, the Sigmaverse takes place over the course of three eras, focusing not only on its namesake, the SPARTAN-II's of Project SIGMA, but on a number of other characters who made an impact in the universe. This would also include the SPARTAN-I's of the ORION Project, Insurrectionist rebels, a number of mercenaries and criminals operating outside the law and the heroic SPARTAN-IV's, each with their own storylines within the universe.
While the Sigmaverse is currently closed to new applicants, crossovers with other universes are welcome. Please leave a message on Brodie-001's talk page if you are interested.
Eras[]
ORION[]
The ORION Era (2490-2517) covers the end of the 25th Century and the start of the 26th. It is a time of great change for mankind as the threat of rebellion looms overhead, and largely covers the exploits of the men and women of the ORION Project from their first successful operations to the tragedies and failures that ended it, eventually leading up to the inception of the SPARTAN-II Program and the offshoot that gave this universe its name.
Covenant[]
A major part of the Sigmaverse, the Covenant Era (2517-2553) covers nearly forty years, largely focusing on the devastating Human-Covenant War and the battles that occurred during this period. As most of Halo canon takes place here, Sigmaverse characters will take part in a number of well-known events, from the Harvest Campaign to the Battle of Earth. This era also has the biggest focus on the original Sigma Team, a group of nine SPARTAN-II's who fought to defend humanity during this conflict.
Rebellion[]
The Rebellion Era (2553 onwards) is the latest period of history in the Sigmaverse and covers the numerous conflicts following the Human-Covenant War. While the immediate threat of the Covenant has passed, this era sees the emergence of several new factions as the galaxy becomes a much more dangerous place, leading up to mankind's battle against the Created and subsequent war against the Banished.
Other Features[]
United Nations Space Command[]
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Like it or not, we're humanity's best chance for survival. | ![]() |
SPARTAN-I
- Richard Mack Senior
- Anton LaMarche
- Tobias Crowley
- John Ackton
- Frederick King
- Steven Hawkins
- Harold Redford
- Teresa Morrison
SPARTAN-II
- Jax-007
- Nef-015
- Grigori-018
- Marco-035
- Luisa-026
- Wulf-041
- Stanley-048
- Resk-063
- Elena-071
- Irene-074
- Jacob-076
- Jack-085
- Kane-098
- Trevor-119
- Ahmad-126
- Pierre-127
- Amy-133
- Hank-136
- Derek-142
- Fenn-145
- Kryss-216
SPARTAN-III
Alpha Company
- Frank-A103
- Dan-A105
- Jordan-A111
- Alex-A121
- Nelson-A122
- Eugene-A133
- Martin-A136
- Sal-A142
- Dom-A178
- Dorian-A188
- Chris-A189
- Louie-A199
Beta Company
Gamma Company
- Jiang-G007
- Clarence-G022
- Amos-G028
- Alric-G040
- Clayton-G045
- Graham-G101
- Mordecai-G138
- Cesare-G177
- Flynn-G189
- Ianto-G200
- Julian-G209
- May-G210
- Ezra-G323
SPARTAN-IV Program
- Richard Mack Junior
- Ronald Klein
- Anna Volkov
- Devin Harland
- Mikhail Schultz
- Rita Skala
- Molly Heyes
- Umar Ashur
Orbital Drop Shock Troopers
- Henry McNair
- Ash Mitchell
- Mira Reyes
- Martin Keel
- Gregor Papadakis
- Steven Embry
- George Calzaghe
- Yin Maxwell
- Vincent Angelo
- Victor Denley
- Michael Green
- Bill Cross
Army
Navy
- John Hawkins
- Joseph Harris
- Michael Hsu
- Uriah Maxon
- Samantha Jones
- Andrei Fosse
- Reynald Donnelly
- Lin Zhi
Marine Corps
Air Force
Artificial Intelligences
Colonial Militia
[]
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When were you under the impression that we weren't watching you? | ![]() |
Officers
Scientists
Field Agents
- Alexander Redford
- Peter Yang
- Kyle White
- Shelley Morgan
- Mark Hall
- Ruben Lykos
- Jill Urbach
- Markus Novak
The Covenant[]
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On the blood of our fathers, on the blood of our sons. | ![]() |
Sangheili[]
Covenant Military
- Iroe 'Nemokee
- Deyad 'Marakee
- Alval 'Ulvanee
- Ran Tur 'Ontokee
- Ren 'Telamee
- Ordam 'Ranakee
- Yama 'Ranakee
- Uron 'Nar Ontomee
- Ker 'Montunee
- Yorru 'Talanee
Swords of Sangheilios
True Vanguard
Imperium of Clarity
Sellswords and Rogues
Jiralhanae[]
Kig-Yar[]
Unggoy[]
Lekgolo[]
San'Shyuum[]
Yonhet[]
The Insurrection[]
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We will rise. | ![]() |
United Rebel Front
Dynasty Crew
Unaffiliated
- John Verensky
- Mal Roberts
- Jonathan Ulan
- Anatoly Kustentov
- George McClusky
- Oswald Schumer
- Hjalti Marksson
New Colonial Alliance
Others[]
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Looking out for number one. | ![]() |
Civilians
Criminals
Mercenaries
Forerunner
25th Century
- 2482
- Anton LaMarche joins the UNSC Marine Corps.
- 2483
- 2484
- After an uneventful tour, Anton LaMarche leaves the Marines and joins the NYPD's SWAT Team on Earth.
- 2485
- 2486
- 2487
- Yama 'Ranakee becomes the Kaidon of Ranak.
- 2488
- Richard Mack's adoptive father is murdered by a local gang. Mack attempts to hunt down the killers, and is rescued by Anton LaMarche's SWAT Team.
- 2489
- Richard Mack joins the UNSC Marine Corps.
- 2490
- 2491
- The ORION Project is launched.
- Richard Mack, Tobias Crowley and Anton LaMarche are among the first 65 subjects recruited for ORION.
- Leonard is created to assist in military training.
- 2495
- Richard Mack meets Frederick King and Daniel Black in Mars OCS.
- Yama 'Ranakee becomes Kaidon of Clan Ranak.
- Viktor Perrin joins the UNSC Marine Corps and is later transferred into the ORION Project
- 2496
- The ORION's are first deployed for Operation: CHARLEMAGNE.
- Trident Team is formed and takes part in Operation: BRIMSTONE.
- 2497
- 2498
- February 6th-8th: Operation: SWEEPER is a success due to ORION intervention.
- March 28th: A cult detonates an explosive device on Eridanus II. The ORION Javelin Team are caught in the blast, losing one member while the rest are hospitalised.
- April 1st: Viktor Perrin is discharged from ORION after severe side effects from his augmentation lead to a psychotic break while recovering from a combat injury.
- April 4th: Trident Team sucessfully eliminated an Insurrectionist group on Phoros IV
- Calvin Roe is recruited by the Office of Naval Intelligence.
- November 17th: Operation: HEART OF DARKNESS. Insurrectionists destroy an Insurrectionist arms factory.
- 2499
- Operation: SPARTACUS. Criminal groups on Troy massacred, ORION brutality questioned.
- Abd-al-Qadir ibn Asad and the other children from Troy are placed into rehabilitation.
- Heimdall Incident. Oleg Lombardi's rebels are defeated and the facility is secured.
26th Century
- 2500
- Richard Mack receives the Colonial Cross and is heralded as a hero in the media.
- Odin is created by the Office of Naval Intelligence.
- 2501
- Viktor Perrin establishes Colonial Security Services, a PMC dedicated to the training of Colonial Militias throughout the Outer Colonies. Among the group's founders are a number of ORION washouts and former UNSC personnel.
- 2502
- Captain Richard Mack and Corporal Avery Johnson take part in Operation: KALEIDOSCOPE.
- 2503
- Abd-al-Qadir ibn Asad, Omar Afiz and Kira Reyes are adopted by Viktor Perrin.
- 2504
- The Schönheit Rebellion takes place. A bloody campaign lasting six months occurs until the Unified Earth Government brokers an official ceasefire. While seen as a show of weakness against the Insurrection, it ends the bloodshed immediately.
- 2505
- Project BRUTUS is set up, with Frederick King as its first agent.
- 2506
- 2507
- Henry McNair joins the UNSC Marine Corps.
- 2508
- 2509
- Richard Mack Junior is born.
- 2510
- A large Insurrectionist force is destroyed on Biko.
- 2511
- Most of the SPARTAN-II candidates are born.
- Lieutenant Samantha Jones kills a group of terrorists trying to seize the UNSC Good Intent, and is promoted for her efforts.
- Colonial Security Services are widely praised in the media for wiping out a crime syndicate on Bhuj.
- 2512
- Abd-al-Qadir ibn Asad is betrayed by Viktor Perrin and almost killed. He is taken into custody by ONI.
- 2513
- Henry McNair joins the Orbital Drop Shock Troopers and is trained by Richard Mack Senior.
- Following the execution of two assassins, a number of Sangheili clans attack Ranak Keep. Felo, Sur and Rol Ranak escape.
- Felo 'Ranak and his brothers journey through the mountains to a nearby city.
- Felo 'Ranak returns at the head of an army and crushes the attackers.
- Yama 'Ranakee dies in a duel with Felo, and Ordam 'Ranakee takes up his position as Kaidon.
- ONI initiates Operation: MASQUERADE to halt the spread of 'Rocket' through the colonies.
- 2514
- The Lion's Claw PMC is contracted by the CMA to assist with security in establishing new colony worlds.
- 2515
- Led by Major Mehaffey, Henry McNair's ODST platoon prevents a terrorist attack on Reach.
- Felo 'Ranak, now Felo 'Ranakee, joins the Covenant military.
- 2516
- The Sixteenth Unggoy Disobedience is put down by Ripa 'Moramee. Felo 'Ranakee participates in the conflict.
- 2517
- The SPARTAN-II Program is launched by Doctor Catherine Halsey.
- Project SIGMA is launched by Doctor Calvin Roe as an offshoot of SPARTAN-II.
- Marion Hollister drops off the grid after finding out that the UNSC had taken her son.
- Marco-035 befriends Jack-085 and Elena-071.
- Toru 'Makhanee foils a terrorist attack aboard the Unyielding Hierophant
- 2518
- 2519
- 2520
- A leaderboard is implemented for the Project SIGMA trainees.
- Battle of Asphodel. The Insurrection is dealt a heavy blow, though the heavy involvement of Private Military Companies in the conflict is criticised.
- 2521
- The Project SIGMA trainees participate in a month-long survival and evasion test in the jungles of Arcadia.
- 2522
- 2523
- The mercenary group Lion's Claw destroys a rebel outpost on Reach.
- 2524
- Simon Petrovich is contracted by ONI to assist with work on the MJOLNIR project.
- 2525
- The Ninth Age of Reclamation begins.
- First Battle of Harvest.
- Reach trained SPARTAN-II's undergo augmentations, many washing out or dying.
- SIGMA SPARTAN-II's undergo augmentations. Due to major medical advances in the last two months, the casualty rate dropped significantly. All trainees survive.
- Derek-142 is wiped from Project SIGMA's records.
- Jack-085 and Ahmad-126 escape the SIGMA facility. Ahmad is later found dead and Jack disappears.
- Robert Watts is captured by the UNSC. Adam Makosky rallies his troops and flees to Victoria.
- The UNSC is put on full alert for the Covenant.
- Jack arrives on Roost, and contacts the United Rebel Front.
- 2526:
- Second Lieutenant Henry McNair leads an ODST operation on Andesia.Though a large rebel force is destroyed, a number of young troopers are killed.
- Fall of Circinius IV.
- Sigma Team is deployed for the first time and destroys a large Insurrectionist base on Gallis.
- Calvin Roe is reassigned to the Materials Group to assist with Project MJOLNIR.
- Richard Mack Senior and several other commanders are recalled by the UNSC to help fight the Covenant on Harvest.
- Harold Redford is killed by Rol 'Ranakee on Harvest.
- 2527
- Carlos Driscol and Richard Mack Junior enlist with the UNSC Marine Corps.
- 2528
- Richard Mack Senior takes command of a Marine Company on Harvest and leads them to several victories.
- 2529
- Tobias Crowley is assassinated by BRUTUS agents on Reach shortly after his release from prison.
- 2530
- Skirmish on Brennus. Sigma Team fight Covenant forces for the first time.
- 2531
- Richard Mack Junior meets John Ackton and undergoes ODST training.
- Carlos Driscol, Mira Reyes, Gregor Papadakis and Steven Embry join the ODST's alongside several others in what would become the famous 'class' of 2531.
- Harvest is retaken by the UNSC.
- Jack and Howard Graves create a plan to capture a SPARTAN-II Team. Due to the recent addition of a fifth member, it fails and Graves is killed.
- The SPARTAN-III Program is initiated. Frederick King and the BRUTUS unit are used to help recruit orphaned children across multiple colony worlds.
- 2532
- Whiskey-04 is formed.
- Operation: STARFALL.
- After the suicide of his friend Graham Alban, Simon Petrovich leaves ONI after he begins to regret his assistance in the MJOLNIR and SPARTAN-II Projects.
- Lead by Jack, the remnants of Graves' URF force join up with Adam Makosky in the Outer Colonies.
- 2533
- Petrovich encounters an Insurrectionist group on Roost, and pledges his services to the URF.
- 2534
- The United Rebel Front forms the 'Omega Group', a think tank of its best scientists.
- Battle of Sethlans. Sigma Team and Whiskey-04 destroy a Covenant scouting group and save the burgeoning colony world.
- 2535
- Battle of Ruaidri.
- Battle of Charybdis IX.
- Battle of the Rubble. Amanda Wade's family ends up on Falaknuma.
- Adam Makosky and his closest allies enter cryosleep aboard the URF Revolutionary Fervor, hoping to escape the UNSC.
- 2536
- 2537
- March: The Mamore Campaign ends with a UNSC victory. Richard Mack Senior is publicly credited and promoted to Colonel.
- July 27th: Operation: PROMETHEUS is a success, though Alpha Company is all but destroyed.
- Admiral Margaret Parangosky covers up the survival of twelve Spartans from Kurt Ambrose, and forms Upsilon and Tau teams.
- Battle of Prospect. ODST's save thousands of civilian lives in a mass evacuation.
- Beta Taurius II Campaign begins.
- 2538
- Beta Taurius II falls to the Covenant.
- Alexander Redford survives a Covenant raid on the UNSC Apples and Pears.
- 2539
- Battle of Kholo.
- SPARTAN-III Beta Company formed.
- Layla-B101 joins the Headhunters and is partnered with Grantley-B130.
- 2540
- 2541
- With assistance from the Omega Group, Colonel Jack begins to make plans for the Hephaestus Array.
- 2542
- Emerald Cove is abandoned and many colonists are forcibly evacuated.
- The United Rebel Front establish a base on the now-abandoned Emerald Cove to be used as a supply station.
- 2543
- Sigma-Beta Team destroys a Covenant encampment on Sidonis.
- Battle of 18 Scorpii.
- Battle of Psi Serpentis. Admiral Cole presumed dead.
- 2544
- Battle of Miridem.
- Several badly-damaged UNSC vessels are stolen following the battle by a group of rebel salvage ships. Local forces do not pursue.
- December 1st: Raid on the Umbra Tempestus. Sigma Team escape a Covenant ambush, though several of the Spartans are wounded.
- 2545
- Fall of Kurovan.
- Ash Mitchell and Mal Roberts join the ODST's.
- Battle of Draco III. Henry McNair sacrifices himself to take out an entire Covenant Legion.
- Battle of Actium.
- Operation: TORPEDO. Beta Company is all but destroyed.
- Selection for Gamma Company begins.
- Fall of Schönheit. Pierre-127 and Hank-136 are presumed dead.
- 2546
- March 2nd: Battle of Gress. Covenant denied access to a Forerunner crystal due to Marco-035's efforts.
- Layla-B101 is captured by the Covenant and taken to Sanghelios. She is presumed dead by the UNSC.
- Operation: RISING DRAGON. Frederick King is put on trial, but is exonerated for his actions.
- Tantalus Massacre. Gregor Papadakis is killed by rebels and Carlos Driscol becomes disillusioned with the UNSC.
- Battle of New Llanelli. John Ackton is killed. Richard Mack Junior receives the Silver Star for his efforts there.
- 2547
- Battle of Skopje. Carlos Driscol abandons his unit and defects to the URF.
- Siege of Fargad. Covenant advance into the Inner Colonies stalled. Richard Mack Senior receives the Colonial Cross a second time for his actions there.
- After his return to Sanghelios, Felo 'Ranakee meets his wife, Tari.
- Toru 'Makhanee executes his mentor, Ker 'Montunee, for treason. He is promoted to the rank of Fleet Master, but is then immediately exiled to patrol the Covenant's fringe worlds by the Prophet of Truth.
- 2548
- Faisal Khan leaves Earth and joins up with a group of freelance traders, learning to fly starships in the process.
- Battle of Algois. Calvin Roe is forced to call for the destruction of his latest prototype suit.
- Sigma-Gamma Team disappears.
- 2549
- Remi Marshall leaves his family to join the URF.
- Battle of Nevarra. Markus Jensun surrenders peacefully to the UNSC due to Sigma Team's efforts.
- Siege of Paris IV.
- 2550
- Markus Jensun is assassinated by BRUTUS operatives.
- URF soldiers hijack an ONI ship containing a prototype MJOLNIR suit. A battlegroup is assembled immediately to reclaim it., alongside several members of Sigma Team.
- Battle for the Hephaestus Array. Jacob-076 and Amy-133 are declared MIA.
- Jack-085 is rebuilt by Simon Petrovich and the Omega Group.
- 2551
- Cronus IV is attacked. Marco-035 and Resk-063 defend the colonists using prototype versions of the shielded MJOLNIR Mark V armour.
- Layla-B101 escapes from Sanghelios on a Covenant cruiser after butchering dozens in Marak Keep.
- Rora 'Marak is blamed for the death of much of his family and also flees Sanghelios in a stolen shuttle.
- Battle of Yusaris II. Gunnery Sergeant Ash Mitchell rescues Layla, who is then taken by ONI agents. The battle ends in a UNSC victory.
- Layla begins rehabilitation on Reach.
- Hyperion Industries commissions a new line of armoured Freighters on Mamore to help revitalise the planet's industry.
- Carlos Driscol's forces battle Lion's Claw mercenaries under the command of Abd-al-Qadir ibn Asad.
- After initial therapy, Layla is transferred to Camp Häyhä, where she retrains with her partner, Grantley-B130.
- 2552
- Battle of Ariel.
- Driscol leads a large Insurrectionist force to Mamore.
- Battle of Harpa. Richard Mack Senior, Fenn-145 and Nef-015 are killed.
- Battle of Fumirole.
- May 10th: Layla-B101 takes part in the first combat run of the YSS-1000 Sabre, working alongside SPARTAN-B312 and SPARTAN-B031.
- Driscol's army is decimated and scattered on Mamore by SPARTAN-B312.
- Led by Remi Marshall, the Insurrectionist remnants on Mamore steal the newly-constructed Dynasty from a shipyard and escape the system.
- July 19th: Rora 'Marak faces down a large group of Sangheili bounty hunters on Karava, but is presumed dead. He steals the armour of a fallen enemy and takes on a new name: The Outrider.
- July 20th: Battle of Dorvyesk III. Resk-063 is killed.
- July 24th: The Fall of Reach begins.
- August 9th: Spartan teams Sigma, Upsilon and Tau are deployed to Reach after WINTER CONTINGENCY is declared.
- August 12th-13th: Battle at Szurdok Ridge.
- August 14th: Operation: UPPER CUT is a success, though one Spartan is lost.
- August 15th: Operation: DROPKICK. Two SPARTAN-III's KIA, though several Covenant ships are destroyed.
- August 18th-23rd: Siege of New Alexandria.
- Four Spartans are believed to have been killed by Calvin Roe after the premature detonation of explosives across the Materials Group building. Presumed dead, they are covertly rescued and extracted from reach by Red Cell.
- August 22nd: Battle of Outpost Foxtrot-Whiskey. Two SPARTAN-III's are killed, as is Doctor Calvin Roe. The Spartans delete all evidence of what occurred at the base from their helmet recorders.
- August 29th-30th: Battle of Aszod. A few surviving Spartans escape with Whiskey-04 aboard the UNSC Bright New Day.
- August-November: Battle of Tribute. Layla-B101 is deployed for the first time since her return to the UNSC. Deyad 'Marakee is killed.
- September 2nd-18th: Loss of Hope. The reformed Sigma Team scavenge a new FTL drive for their Frigate and escape before the planet's destruction.
- September 18th-28th: Battle of the Zenith Complex
- Elena-071 meets with Sigma Team for the first time in nearly thirty years, and initiates Operation: ASPHALT.
- Sigma Team and Elena encounter Forerunner ruins on the planet, and manage to extract a great deal of data while fending off Covenant forces.
- Elena leaves the others and escapes in the UNSC Heavens Asunder while they return to the Bright New Day.
- October 14th-15th: Battle of Second Sanctum
- Sigma Team encounters Battle Group Cossack and are recruited for a dangerous mission to assault a key Covenant outpost.
- A lengthy battle is fought over Second Sanctum, culminating in the rescue of Human POW's and the destruction of the Covenant fortress via nuclear weapons. However, only a small fraction of UNSC forces escape the battle.
- October 21st: Gamma Company is deployed to Terceira and crushes a rebel uprising there.
- Battle of Earth.
- Team Shashka defends the Quito Space Tether and destroys a Covenant cruiser at the cost of Flynn-G189.
- Battle for Moscow. The Bright New Day is sacrificed to destroy a Covenant ship.
- Battle of Sector Six.
- Layla-B101 leads the defence of Beweglichkeitsrüstungsysteme.
- Team Scythe fights the Covenant for the first time after being deployed to Boston.
- Battle of Voi.
- Battle of the Portal. Sigma Team leads the defence against the remaining Covenant forces on Earth.
- Battle of Installation 00. The Covenant are defeated.
- December 4th: Toru 'Makhan promotes himself to the rank of Imperial Admiral after purging the dissidents from his ranks, forming the Imperium of Clarity.
- 2553
- March 3rd: The Human-Covenant War ends.
- March 11th:Alexander Redford meets Remi Marshall and Faisal Khan while undercover on Venezia.
- July 2nd-6th: Gao Conflict.
- July 25th: Jack-085, now known as Magnus, is first sighted raiding an Outer Colony supply depot.
- August 1st: The first wave of Human recolonisation begins as ships move to re-settle Circumstance, which was the least-damaged former colony in the Epsilon Eridani system.
- August 19th: Abd-al-Qadir ibn Asad retires, disbanding Lion's Claw with him.
- September 20th: George McClusky joins up with a rebel group with his girlfriend.
- December 28th: Team Wakizashi is all but wiped out by Rora 'Marak's mercenaries during a botched mission.
- 2554
- Draco III Rebellion.
- Battle of Draetheus V.
- January 1st: Project SIGMA is officially shut down.
- January 8th: Siege of Yawada. Richard Mack Junior distinguishes himself as a hero after bringing down Uron 'Nar Ontomee's Covenant faction after a bloody battle. Frederick King's ship, the UNSC Nightingale, participates and saves Mack's men, including a wounded Ash Mitchell.
- March 9th: After a violent outburst, Layla-B101 is imprisoned in the Midnight Facility.
- April 2nd: A UNSC spy probe picks up a message warning people to stay away from Schönheit.
- April 4th: Operation: ASHES. Pierre-126 is eliminated.
- April 10th: Hank-136 is recovered from a Slipspace field pod and eventually resuscitated.
- April 11th: Mal Roberts defects to the Insurrection and heads to Venezia.
- April 21st: Jonathan Ulan escapes to Venezia while facing court martial and ends up meeting Mal Roberts.
- June 6th: John Verensky is recruited by the Office of Naval Intelligence.
- June 11th: Hired by Jul 'Mdama's Covenant faction, Rora 'Marak's mercenary group participates in a failed attack on a battlecruiser controlled by the Swords of Sanghelios. Marak is spared by Felo 'Ranak, who gives him new purpose as leader of the newly-formed Shadows of Retribution.
- June 18th: The remnants of Marak's forces are united under Dorenn Tenon, forming the True Vanguard as a militant Sangheili organisation.
- July 1st: Fireteam Thor is formed, comprising of Layla-B101, Hank-136 and Mordecai-G138.
- July 17th-28th: Operation: GOLDSTOM: Fireteam Thor wipes out a large Kig-Yar pirate group in the Outer Colonies.
- August 22nd: Armand is created from the cloned brain of Alexander Redford.
- August 25th: Operation: CATFISH. Kane-098, Jax-007 and Marco-035 assassinate the Jiralhanae Chieftain, Meridus.
- August 29th: An investigation of Asteroid WT-95 leaves Agent Peter Yang and several ODST's dead. John Verensky is the only survivor.
- September 1st: Shrike Team is formed.
- September 2nd: Amanda Wade joins Remi Marshall's Insurrectionist group on Circumstance after being discharged from the military. That day, Shrike Team captures Johan Hennerman and Rizhan Kama, and survives an attack by a group of unknown mercenaries.
- September 5th: Mike Goldberg is crippled by Leandra-B031 as their Insurrectionist cell escapes Circumstance.
- September 18th: Winston Zhou leads his own unit into battle for the first time.
- October 9th: Project HAYABUSA is restarted by Doctor Malcolm Bright.
- October 14th: Armand attempts to access highly-restricted files and is fragmented by Odin.
- December 2nd: A number of Insurrectionists meet up on the Caucasus Station, where they are recruited by Magnus and John Verensky.
- December 9th: Armand is rebuilt after his fragmentation. Shrike Team eliminates a Jiralhanae terrorist group on a moon once controlled by the Covenant. Though successful in their mission, Cesare-G188 is killed.
- 2555
- January 12th-February 24th: Operation: GOLGOTHA. Marco-035 goes undercover.
- February 15th: Ash Mitchell leaves the UNSC.
- March: Operation: FAR STORM.
- March: Invasion of Earth.
- March 1st: Mass breakout from Fenwell Prison. Carlos Driscol and Isebelle Marshall are rescued by the Dynasty.
- March 4th: Mike Goldberg and Isabelle Marshall are sent to a base on Emerald Cove, which had been abandoned long ago by the UNSC.
- March 9th: Magnus' forces arrive at Sargasso's north pole, making use of an abandoned weather station to construct a permanent base there.
- March 17th: The Shadows of Retribution and Rora 'Marak encounter a Sangheili pirate faction with an outlaw masquerading as the Outrider at its head, and begin hunting them down.
- April 3rd: A remote contact team led by Alex-A121 finds and destroys a Flood containment facility on a former Forerunner world.
- April 10th: With advice from Alex, a Spartan unit known as the Blackwatch is set up in case of future Flood outbreaks.
- April 14th: Malcolm Bright is killed in a lab accident.
- April 17th: General Cole Warrick takes control of Project HAYABUSA.
- April 7th: Carlos Driscol rescues Winston Zhou from Talitsa, but loses his leg in the process.
- April 21st: Driscol leaves Zhou with Abd-al-Qadir ibn Asad for training.
- August: Operation: COALPEPPER.
- August 11th: Cole Warrick dies in a car crash on Earth, later found to have been a setup by Magnus.
- August 20th: HAYABUSA loses nearly half of its soldiers in a botched operation.
- September 14th: John Verensky launches a large-scale attack on Earth.
- The remaining HAYABUSA soldiers defect and attempt to kill the UEG leadership, but are stopped when Alexander Redford blows his cover and saves several high-ranking individuals.
- Sur and Rol Ranak fail to assassinate Thel 'Vadam and their brother, Felo.
- After a lengthy chase, Jonathan Ulan is killed by Martin-A136.
- Led by Amanda Wade and Remi Marshall, a group of rebels manage to steal a NOVA bomb from PILLAR Base.
- The Dynasty manages to escape the Sol System and the Home Fleet by threatening to detonate the NOVA bomb.
- September 19th: John Verensky grows extremely paranoid, and moves the NOVA bomb to New Albion for safekeeping.
- November 8th: Rebel forces under orders from Verensky detonate a chemical weapon in Kuiper. 300,000 die and Amos-G028 commits suicide.
- November 31st: Adam Makosky and his crew emerge from cryogenic suspension aboard the URF Revolutionary Fervor after being discovered by Miriam Bakos' forces.
- December 9th: Operation: CAUTERIZE begins.
- The Caucasus Station is attacked by a UNSC Fleet. Its defences are destroyed within a few hours. Rol 'Ranak is killed along with Alric-G040 in his attempt to detonate an antimatter bomb.
- Magnus murders Mal Roberts, Remi Marshall, and most of the surviving rebel leaders.
- December 10th: Battle of New Albion. John Verensky and Sur 'Ranak are killed, and the NOVA bomb is secured. Several SPARTAN-III's die fighting Magnus, who manages to escape.
- Alexander Redford cuts off his own hand to survive the attack.
- December 11th: Amanda Wade assumes command of the Dynasty.
- December 12th: Shrike Team is disbanded.
- December 15th: Rioting breaks out in Kuiper in response to the poorly-handled crisis.
- December 27th: Ash Mitchell joins up with Magnus and his group of mercenaries.
- December 31st: Winston Zhou finishes his training under Asad and begins operating as a hitman in the Inner Colonies.
- 2556
- Mission to Cleyell
- January 18th: Magnus and Mitchell rob a freighter en-route to Circumstance, but are stopped from killing numerous hostages by Bill Cross and Devin Harland.
- February 7th: Sedra Terrorist attack and Mission to Alpha Shard.
- February 8th: Amanda Wade founds Avalon, the first Human settlement on Emerald Cove since its abandonment during the Human-Covenant War.
- February 11th: Alexander Redford wipes out an Insurrectionist group on Mars.
- February 16th: Ash Mitchell is framed by Magnus during a bank robbery and nearly killed in a mass bombing. Made out as the main perpetrator of the attacks, he is labelled the 'Butcher of Kuiper' by the media. A massive manhunt begins.
- March 1st: After a failed assassination attempt on Toby Maxwell, Winston Zhou loses an eye and is nearly killed by Gordon Mills. He is taken in by Amanda Wade of the Dynasty and healed up.
- March 10th: Toby Maxwell is hunted down and murdered by a vengeful Zhou.
- March 19th: Noctus Incident
- The Minutemen destroy a number of ONI safehouses in Noctus.
- Ash Mitchell is employed by Redmond Venter and attacks a number of police stations. He is then attacked by an Insurrectionist assassin in the street, but manages to kill his attacker.
- George McClusky is captured, tortured and killed by the Minutemen.
- Adam Makosky is assassinated.
- March 20th: Numerous criminal gangs launch attacks in Noctus, disrupting a UEG summit there.
- Mitchell is taken to meet with the Minutemen to arrange his transport offworld. A standoff ensues when he meets Driscol for the first time in years. The UNSC launch a massive attack on the Minutemen, allowing them to both escape in the confusion.
- The Minutemen are killed or captured by the UNSC. Driscol flees Andesia aboard his personal Yacht.
- March 22nd: After escaping the planet, Ash Mitchell moves to Gilgamesh with his new identity as 'Henry Roberts'.
- April 4th: Winston Zhou rejects an offer to join Project BRUTUS, though he accepts independent paying contracts from ONI after surviving an assassination attempt shortly after.
- April 30th: Driscol's mercenary unit are captured by Winston Zhou and taken to a base run by the New Colonial Alliance, where they are recruited by General Robert Amenwae and used to wipe out a UNSC encampment. He is then given an official position within the NCA.
- July 18th: Ash Mitchell reveals his true identity when he dons his old armour to defend Gilgamesh from a large group of Kig-Yar pirates. While he is hailed as a hero by some, this attracts ONI agents who attempt to hunt him down.
- July 21st: Mitchell is able to avoid BRUTUS operatives and escapes to Mamore, where he is immediately captured. One of his eyes is cut out after a failed escape attempt.
- September 3rd: Raid on Mamore
- Marco-035 is deployed to Mamore to wipe out a rebel enclave there and assassinate Roger Maxon, an important NCA figurehead.
- Ash Mitchell is rescued from Mamore by the Dynasty, and Amanda Wade, with Marco's assistance.
- Maxon escapes Marco on Mamore, though his force there is wiped out.
- September 4th: The Dynasty arrives back in Avalon.
- September 6th: Alexander Redford and Layla-B101 destroy Camp Watts on Talitsa, before the former is contacted by Frederick King for a special mission.
- September 9th: After capturing and interrogating Hadvir Erikkson, Amanda Wade and Ash Mitchell go after Anatoly Kustentov, trying to find Magnus' location.
- September 13th: Kustentov is captured by BRUTUS agents.
- September 14th: The UNSC Demeter arrives at Emerald Cove, and briefly contacts the settlement of Avalon.
- Avalon vows to remain independent from the UEG, causing a heated debate on colonial self-rule.
- September 16th: ONI covertly deploys Layla-B101 to Emerald Cove under civilian guise to destabilise the independent colony while an invasion force is prepared.
- September 18th: Iris Touré is murdered by BRUTUS before she can deliver a speech to the UEG regarding Avalon and peaceful colonial self-rule.
- September 20th: Raid on Sargasso
- Led by the Dynasty, a small fleet of vessels from Avalon travel to Sargasso in search of Magnus.
- Magnus is tracked down and almost killed. He escapes at the cost of his current base.
- The Omega Group passes information regarding the creation of combat-enhancing drugs to The New Colonial Alliance through Magnus. Though illegal, they are designed to give the NCA's soldiers a much-needed advantage.
- Frederick King and the BRUTUS contingent initiate Operation: GLASS HOUSE on Emerald Cove.
- Fall of Avalon.
- September 21st: Visiting a temporary prison camp in the ruins of Avalon, Frederick King forcibly recruits Saernus as an ONI spy, kills Mike Goldberg and reunites with Marion Hollister after nearly forty years. Hollister is able to sabotage King's shuttle as it leaves the planet, crashing it into Emerald Cove's oceans.
- September 22nd: With King alive but in a coma after the shuttle crash, Admiral Serin Osman personally promotes Alexander Redford and makes him head of the BRUTUS division.
- September 23rd: The UNSC faces widespread criticism following Avalon's fall, forcing several high-ranking resignations among the United Earth Government. Insurrectionist propaganda begins to seep into the Inner Colonies as colonial discontent spreads.
- September 28th: Hadvir Erikkson is murdered by BRUTUS.
- 2557
- February 27th: Martin-A136, Alex-A121 and Louie-A199 stop a bomb threat during the UNSC Infinity's commissioning ceremony.
- March 1st: An independent ship, the Starsailor, is raided by the Dynasty's crew, who leave only a single survivor.
- March 3rd: Bess Rivers meets with Alexander Redford on Earth, who recruits Abd-al-Qadir ibn Asad as her partner/bodyguard. Asad is given orders to recover a stash of nuclear weapons from the planet.
- March 4th:
- The Ciudad de Huesos Incident begins.
- The UNSC Agrippa is destroyed over Madrigal via internal sabotage by Winston Zhou.
- The Dynasty arrives at the Ciudad de Huesos. Its crew are immediately detained.
- Asad and Rivers land on Madrigal and discover the old Colonial Security Services bunker, though they are greeted by Carlos Driscol and taken back to Ciudad de Huesos.
- The Agrippa's survivors are decimated by Carlos Driscol's forces, leaving only four ODST survivors.
- March 5th:
- The troopers manage to infiltrate the city and destroy its protective Spires, accidentally inciting a rebellion amongst the populace.
- The crew of the Dynasty' escapes captivity thanks to Winston Zhou and meet with the ODST's before fleeing aboard their ship.
- A lengthy battle ensues around the CSS Bunker between Carlos Driscol's forces and the combined UNSC/Avalon crew as they seek to uncover the nuclear weapons. A large portion of the combatants are killed before the UNSC's Sixth Fleet enters the 23 Librae System. The Dynasty is struck by an Archer missile and crashes.
- Fireteam Thor is dispatched to the planet's surface and decimates the rebel forces there. Carlos Driscol is shot dead. Amanda Wade and Ash Mitchell escape the planet with a single HAVOK tac-nuke, though the former is badly wounded by Layla-B101.
- Alexander Redford recruits both Bess Rivers and the ODST Bill Cross for Project SAFEGUARD, while Fireteam Thor discovers that one of the nuclear weapons is missing.
- The UNSC moves troops into Ciudad de Huesos, formally ending its rebel occupation and paving the way for potential recolonisation of Madrigal.
- March 29th: On the colony world of Losing Hand, Mitchell and Wade plan to resume their pursuit of Magnus, using their HAVOK nuke as a trump card against him.
- May 8th: Sigma Team investigates a heavily-guarded Forerunner facility on XF-109.
- April 17th: The Imperium of Clarity begins its campaign of rapid expansion, encroaching on the territory of other Sangheili factions as several star systems are invaded simultaneously.
- July 21-23: Battle of Requiem.
- July 24th: Raid on Ivanoff Station.
- July 25th: New Phoenix Incident.
- July: Battle of Installation 03.
- July: Battle of New Phoenix.
- August 17th: Southerness Incident: Covenant raiders and Promethean constructs attack a small Human colony and abduct its inhabitants despite Sigma Team's interference.
- August 26th: Operation: RAILROAD: Sigma Team break up a large-scale slavery operation and discover that one of the captives was a former ONI agent who had been missing for well over a decade.
- September 1st: Winston Zhou tracks down and kills Gordon Mills, then takes his place within the BRUTUS division.
- December 9th: Violet-B039 rescues BRUTUS agent Jill Urbach from captivity on Foresti. The two are then made partners.
- 2558
- February 7th-March 2nd: Requiem Campaign.
- March 3rd: Fireteam Scythe are deployed to Eirene to eliminate a Sangheili pirate group.
- March 5th: Battle of Ealen IV.
- March 11th: Ambush at Oth Lodon.
- May 9th-10th: Mission to Ven III.
- May 19th: Jill Urbach and Violet-B039 eliminate a cell of the Colonial People's Independence Movement on Erdenet.
- May 20th:
- Red Cell wipe out a UNSC Marine Corps outpost on Erdenet, stealing a high-value package in the process.
- Sigma Team investigate an abandoned ONI bunker on Sansar, and barely escape with some data after an unknown opponent triggers its self-destruct mechanism.
- May 21st: Urbach and Violet are attacked in Bulgan by operatives from two different ONI divisions, but are rescued by Red Cell's Spartan operatives and transported off-world on a cargo ship bound for Biko.
- May 22nd: A meeting is held on Luna between Admiral Serin Osman and several ONI officers to discuss the Erdenet Massacre and their two missing agents, who are blamed for it.
- May 23rd: After briefly going undercover on Sundown, Sigma Team uncover more information on Red Cell, but are attacked by several enemy Spartans. After driving their foes away they are able to obtain a ledger listing a number of sites used by the organisation to transport goods and materials.
- May 24th:
- Urbach and Violet arrive on Biko, where they meet Gustav Klein. He delivers them to an Insurrectionist safehouse appropriated by Red Cell.
- Saernus, while undercover as a mercenary named Gorumus at the safehouse, recognises Urbach and secretly contacts BRUTUS.
- Visiting the Grey Archive on Luna, Sigma Team and Elena-071 learn of Red Cell's operational history and discover that any files pertaining to the group have been tampered with before leaving for Biko.
- May 25th:
- The safehouse on Biko comes under attack by Red Cell's assault platoon. Their assault is foiled by Sigma Team's sudden arrival as the Spartans swiftly wipe them out and capture their leader, who is revealed to be the supposedly long-dead Wulf-041.
- After surrendering to his former team, Wulf reveals that Red Cell is commanded by another missing SIGMA Spartan, Derek-142, who intends to use a program known as OVERSIGHT to forcibly change the Office of Naval Intelligence from within.
- Red Cell seizes Isimud Station, an ONI-run communications outpost.
- May 26th
- Derek-142 sends his ultimatum to the Office of Naval Intelligence's leaders, threatening to expose many of the organisation's secrets to the public via OVERSIGHT and seized communications networks if they do not incorporate his planned changes to ONI and bring him in to its command structure. His demands are soundly rejected.
- Sigma Team, alongside Violet-B039 and Jill Urbach, successfully infiltrate Isimud Station and prevent Red Cell's broadcast.
- Derek-142 is defeated and captured by Marco-035 and Wulf-041. All remaining Red Cell members are killed by microbombs embedded in their neural implants and Dan-A105, Eugene-A133 and Chris-A189 surrender.
- May 29th
- After receiving treatment for his injuries, Derek-142 is taken to Midnight Facility.
- May 30th
- Wulf-041 is officially reinstated into Sigma Team, having been pardoned for his actions.
- The SPARTAN-III's working for Red Cell are pardoned, and brought to Denegroth Station to await further orders.
- Jill Urbach and Violet-B039 are debriefed by Alexander Redford and dispatched on a new mission to capture Amanda Wade and Ash Mitchell.
- June 8th: The United Rebel Front intervenes in a battle between rebel factions on Aleria and begins to provide the locals with vital supplies, gaining a lot of support from insurgent groups there.
- May 31st:
- Derek-142 is visited in Midnight Facility by Admiral Serin Osman.
- July 16th: Battle of Oban.
- July 19th-20th: Battle of Aktis IV.
- August 9th: Fireteam Scythe hunts down a group of Banished after a civilian ship is hijacked.
- August 14th: A merchant from the independent Guild of Free Traders, Isaac Kenner, gains an audience with Toru 'Makhan and convinces the rapidly-expanding Imperium of Clarity to a trade deal that involved the invasion of the Outer Colony mining world of Montak in exchange for control of its resources.
- August 21st: Imperial forces easily capture Montak, allowing the Guild to take control of mining operations there.
- August 24th: A joint UNSC-Sangheili force is attacked and destroyed by the Imperium after investigating Montak.
- August 26th: A meeting is held on Earth regarding the Imperium, lead by Fleet Admiral Terrence Hood. Admiral Lin Zhi is chosen to lead an expeditionary fleet to wage war against the Imperium of Clarity.
- August 27th: Both the Imperium and the UNSC-Swords of Sanghelios task force muster their forces over Frendhal and New Syracuse respectively, gathering both military and mercenary troops in preparation for the invasion.
- August 29th
- The Imperium of Clarity conquers New Syracuse with little resistance. Commander Andrei Fosse is captured, tortured, and convinced to change sides before being sent on a mission to kill the Sixth Fleet's leaders.
- Toru 'Makhan discovers the existence of a Forerunner Shield World not far from the Imperium's territory.
- Battle of Montak:
- The UNSC-Swords of Sanghelios task force launches a full invasion of Montak, engaging the Imperium's fleets in orbit while dispatching thousands of troops to reclaim the mining colony on the surface.
- Commander Nilen 'Feru is captured by the Swords of Sanghelios.
- Rora 'Marak's Shadows of Retribution attempt to assassinate Fleet Master Kan 'Larom, only to be stopped by members of the Kru'desh Legion.
- Using their translocation technology, the Imperium slips the Blissful Solitude through enemy lines to do battle with the Swords' flagship, Questioner, at close range. Though their boarding parties are repelled, Felo 'Ranak is grievously injured in a duel with Field Marshal Orro 'Hendai.
- With their forces in danger of being overrun, the Imperium withdraw from Montak and leave the system.
- Andrei Fosse's shuttle arrives in-system. The double agent warns the Sixth Fleet of the Imperium's conquest of New Syracuse.
- August 30th: The fleets of the UNSC and Swords of Sanghelios pursue two of the Imperium's fleets through slipspace, heading for the Bineb and Yain systems respectively.
- August 31st
- Andrei Fosse badly wounds Admiral Lin Zhi in an assassination attempt, and is killed by Vice Admiral Ryan Samson as he attempts to escape. Samson assumes temporary command of the Sixth Fleet.
- Battle of Bineb:
- Battlegroup Maya, led by Rear Admiral John Hawkins, emerges in the Bineb system and is immediately attacked by a flotilla under Hedan Koti's command, fending off several boarding parties.
- Kan 'Larom and Hedan Koti concentrate their forces over the Fortress of Watchful Peace on Bineb II's moon, Irn, and engage the UNSC fleet.
- Rear Admiral Hawkins dispatches Team Boson to the surface of Bineb II to destroy a large Unggoy settlement with a HAVOK tactical nuke. The mission is successful, wiping the city off the map and killing tens of thousands.
- Unggoy leader Hedan Koti orders his forces to withdraw from the system when faced with the threat of more nuclear strikes on the planet's surface. A brief civil war erupts within the Fortress of Watchful Peace, which is left mostly undefended after the Unggoy abandon their positions. Hedan Koti is killed before he can leave the system.
- The UNSC launches a full assault on Irn, landing troops on the fortress before the Imperium's depleted forces can properly man its defences. Kan 'Larom is forced to abandon his flagship as his fleet is defeated in orbit, and takes momentary command of the base. Before the UNSC's troops can reach the command room, 'Larom and his bodyguards are extracted from the fortress by a commando team led by Shinsu 'Refum and escape the system.
- Commander Mono Puru Kadun is killed by the Spartans of Fireteam Stallion, effectively ending the Imperium's resistance within the Fortress of Watchful Peace. UNSC troops begin to withdraw.
- Battle of Frendhal:
- The joint UNSC-SoS fleet emerges from slipspace and engages the Imperium's gathered fleets over Frendhal. The battle in orbit remains a stalemate for several hours.
- Lead by Captain Erika Ruskin, a number of Broadsword fighter squadrons are able to penetrate the Imperium's defences and destroy several ships, breaking through their battle line and giving the UNSC fleet an opportunity to advance.
- Imperial Admiral Toru 'Makhan joins the battle with his CSO-class supercarrier, Watchful Custodian, turning the tide of battle in orbit through sheer firepower. Ths Sixth Fleet is forced to retreat while the Swords of Sanghelios commit all their forces to a planetary invasion.
- Aided by their prisoner, Nilen 'Feru, the Swords are able to board one of the Imperium's orbital defence stations. Led by Rora 'Marak, the Shadows of Retribution capture one station and use it to destroy several others before translocating to Frendhal's surface, creating a sizeable gap in the Imperium's orbital defences.
- The Shadows encounter troops led by Grono 'Yendam, who fights Rora 'Marak to a standstill. Nilen 'Feru escapes in the confusion, giving Rora's troops enough time to retreat.
- The Swords of Sanghelios besiege Frendhal's capital city, Dival. Field Marshal Orro 'Hendai leads a successful defence for several hours, and kills General Fol 'Taram in a duel before his own death as the Swords bombard most of the city with plasma fire.
- Having received the location of the Imperium's homeworld, the remaining UNSC forces flee the system. Two of the Imperium's fleets pursue them.
- The Watchful Custodian begins to decimate the Swords' fleet, eventually cornering a badly damaged Questioner over Frendhal. Felo 'Ranak and many of his subordinates are able to relocate to another ship before reuniting their own fleet and leaving the planet. The Questioner is then destroyed.
- Toru 'Makhan's surviving forces chase the Swords into Slipspace, ending the Battle of Frendhal.
- September 1st, 2558
- The fleets of the UNSC, Swords of Sanghelios and Imperium of Clarity arrive in the Voden system over the course of several hours, beginning a protracted battle for the Imperium's homeworld of Iradu.
- September 17th-18th: Operation: ATHENA.
- September 29th: Fireteam Horus is sent on a mission to Quincy in the Outer Colonies to investigate reports of Covenant forces trying to unearth a Forerunner artifact. They are forced to flee shortly after their arrival due to the activation of a Guardian.
- September: Raid on Biko Peace Talks.
- October 4th: Battle of Kamchatka.
- October 23rd: Raid on UNSC Argent Moon.
- October 27th: Battle of Sunaion.
- October 28th: The Created Conflict begins.
- Elena-071 and Alexander Redford escape from the besieged Aldrin Base on Luna aboard the Heavens Asunder
- Kane-098 rescues Frederick King from Created forces on a hospital on Asphodel, later meeting up with Redford and Elena.
- The UNSC Peacemaker flees the Sol System, taking Marco-035 and Wulf-041 with it.
- Jax-007 and the SIGMA SPARTAN-III's are stranded on Europa after the Created destroy Denegroth Station, killing most of the Spartans there. They link up with Ianto-G200 and head towards Katreus.
- Amanda Wade and Ash Mitchell launch an attack on Magnus on Gilgamesh as the Created begin their invasion. Their assassination attempt is unsuccessful, and they and Magnus are captured by Violet-B039 and Jill Urbach's ONI team.
- The Created attack Concord and decimate the still-recovering Sixth Fleet. Admiral Lin Zhi and her ship, the UNSC Caspian, remain hidden in a drydock in the planet's northern regions.
- Midnight Facility is attacked by the Created. In the confusion, the rogue AI Merope sacrifices herself to take control of part of the station and free Derek-142, who escapes aboard a Prowler with Isaac Kenner, a stowaway.
- October 29th:
- The Heavens Asunder arrives at a remote ONI supply base. The crew meet up with Fireteam Scythe, who reveal that the True Vanguard have discovered a Halo ring. Despite the imminent threat of the Created, Elena's group and Scythe decide to intercept the Vanguard and eliminate its leadership before they can access the ring's systems.
- October 30th:
- Jax-007's team arrives in Katreus and fight their way to the spaceport, defeating one of the Warden Eternal's bodies. Eugene-A133 is killed by a teammate when a Created AI fragment invades his MJOLNIR suit.
- Fireteam Thor's prowler reaches Concord and boards the UNSC Caspian.
- Jill Urbach's vessel arrives at a naval rendezvous point and docks with the UNSC Peacemaker. Jack-085, Aila Jokela, Amanda Wade and Ash Mitchell are arrested and taken to the ship's brig.
- Derek-142 and Isaac Kenner arrive on the colony world of Andesia. While searching for an old ONI storage bunker they meet with Abd-al-Qadir ibn Asad and his mercenaries, and agree to team up to fight the Created.
- Jax-007's Spartan team execute an in-system slipspace jump to Helios Station, which they soon infiltrate to attack Cavalier, a Created-aligned AI. The Spartans fight their way up through the space station and rescue Vice Admiral John Hawkins from captivity. They escape in a subprowler, but Hawkins and most of his command staff are killed. Hawkins gives the Spartans instructions to find Rear Admiral Ryan Samson before he dies.
- Cavalier is badly damaged by Jax's team on Helios Station, barely surviving an attack on his data centre.
- October 31st
- Fireteam Thor is dispatched to Crossbow Station to search for the missing Fireteam Horus. They are ambushed by Created forces, but hold them off long enough to power up the facility's mass driver. Fireteam Horus emerges from hiding to join them and they are able to fire at the Guardian in Concord's orbit.
- The UNSC Caspian escapes Concord while the Guardian assaults Crossbow Station, fleeing into slipspace with a Condor carrying Fireteams Thor and Horus not far behind them.
- Jack-085 is interrogated by Captain Al-Sayed and Marco-035 aboard the Peacemaker, and agrees to lead the ship to an uncharted world in exchange for their assistance in eliminating the URF's Omega Group aboard the URF Hydra.
- ONI HIGHCOM Facility Bravo-6 is seized by the Created after several days of internal resistance. Odin, the facility's primary AI defender, is confronted by Cortana, who discovers that he is an experimental AI powered by the still-living brain of Anton LaMarche. After being fully digitised into AI form by Cortana with his human memories intact, Odin/LaMarche escapes, fleeing the Sol System in a slipspace COM probe.
- November 7th
- The True Vanguard's forces arrive over Beta Halo, reinforced by former Imperium of Clarity vessels. A Swords of Sanghelios fleet arrives in pursuit of them and a battle begins over the ringworld.
- The Heavens Asunder arrives close to Beta Halo. Avoiding the battle in orbit, Elena-071 has the ship land discreetly on the ring with the intention of seizing its control room. Nuclear weapons are prepared aboard the prowler as a backup option.
- Jack-085 contacts the URF Hydra under the pretense of bringing back an intact MJOLNIR suit, which allows him to board with Fireteam Whiskey, and Wulf-041 hidden aboard his ship. Marco plays dead and is delivered to the Omega Group by Jack. The UNSC Peacemaker emerges from slipspace close to the Hydra shortly after and immediatley disables the frigate's engines before initiating boarding actions.
- Taking advantage of the chaos, Jack-085 kills Doctor Simon Petrovich, head of the Omega Group, and seizes control of the Hydra. The URF forces aboard surrender to the UNSC, including General Miriam Bakos. Jack is taken back to the Peacemaker by Marco and the URF leaders agree to lead to the UNSC forces to Persistence, a hidden colony world populated by former insurrectionists. An uneasy alliance is formed against the Created.
- Derek-142 executes Asad's mercenary team on Andesia after their attempt to abandon their cause. He, Asad and Kenner plan to launch a strike against the Guardian in the planet's orbit via a slipspace bomb.
- Jax-007's Spartan team arrives over Andesia and crash-lands on its surface, hunted by Created forces all the way. After a lengthy firefight they are rescued by Derek and Asad's Winter-class prowler, which returns to Kenner's estate while cloaked. Jax agrees to work with Derek.
- Elena-071, Kane-098, Fireteam Scythe and Alexander Redford deploy against the True Vanguard's forces on Beta Halo, launching an assault on the control room. They are soon joined by the Shadows of Retribution, led by Rora 'Marak. Both groups team up and pursue the Vanguard's leadership into the ring's substructure, discovering a transportation network between its major facilities. A hunt begins for the ring's true control room.
- November 12th
- Amanda Wade is interrogated by Jill Urbach and Violet-B039 aboard the Peacemaker.
- November 13th
- The Peacemaker arrives over Persistence. The ship's XO, Commander Bell, leads a diplomatic mission to meet its inhabitants on the surface accompanied by Fireteam Whiskey, Marco-035, Wulf-041, and the prisoners Jack-085 and Miriam Bakos.
- Halo: In the Dark - April 2498 - September 2517
- Choice - November 2498
- The Shot - March 2502
- Coup - April 2504
- Duel - August 2513
- Mistakes - November 2519
- Back Then - March 2520
- Weakness - December 2521
- Start of Darkness - May 2525
- Improvisation - February 2529
- Loose Ends - August 2529
- Compromise - August 2529
- Boot - August 2531
- Vigil - November 2531 - February 2557
- Retreat - February 2539
- Aftermath - August 2543
- Reminiscence - February 2544
- Overwatch - March 2546
- Breaking Point - August 2546
- Punishment - December 2547
- Memorial - February 2548
- Diversion - October 2549
- Drifting - November 2549
- Something Different - January 2550
- Rebirth - December 2550
- Normalcy - December 2551
- Regrets - April 2552
- Trial Run - May 2552
- The Damned - May 2552
- Revenant - May 2552
- Vagabond - July 2552
- Sacrifice - July 2552
- Orbit - August 2552
- Megszakad a szivem - August 2552
- Guilt - August 2552
- Holdout - August 2552
- Flight - August 2552
- Revelation - November 2552
- Breath - March 2553
- All Quiet - March 2553
- Halo: Mercy Kill - April 2554
- Departure - April 2554
- Division - August 2554
- Back in Action - June 2554
- Halo: Shrike - September 2554 - December 2555
- Partners - April 2555
- First Impressions - December 2555
- Determination - January 2556
- Jacked - January 2556
- Cleaning - February 2556
- Halo: Sanctuary - September 2556
- Reunion - September 2556
- Halo: Salvation - March 2557
- Monolith - May 2557
- Dead Weight - August 2557
- The Death of Winston Zhou - September 2557
- Understanding - November 2557
- Backup - December 2557
- Respite - December 2557
- Shortcut - March 2558
- Schadenfreude - March 2558
- Halo: Oversight - May 2558
- Despair - June 2558
- Derelict - August 2558
- Prelude - August 2558
- Imperium - August - October 2558
- Illusion - September 2558
- Forsaken - September 2558
- Resolve - September 2558
- Oath's End - September 2558
- Takeoff - October 2558
- Trek - October 2558
- Halo: SIGMA - October 2558 -
- Graveyard - December 2558
- Capture - January 2559
- Rescue - January 2559