A timeline of all major events in the Halo universe from the time of the Forerunners through the rule of the Created.
The First Battle of Harvest was humanity's first contact with the Covenant on the planet Harvest in the Epsilon Indi system and the subsequent destruction of the entire colony.
On their first mission as fully augmented Spartan-IIs, Blue Team, consisting of John-117, Samuel-034, Linda-058, Kelly-087, and Fred-104, infiltrate Eridanus Secundus, a hidden United Rebel Front base located in an asteroid field, and capture Colonel Watts.
The Battle of Chi Ceti was a battle between the UNSC Commonwealth and the Covenant vessel Unrelenting in the Chi Ceti system on November 27th, 2525.
The Battle of Alpha Corvi II was a battle between the UNSC and the Covenant forces in the Alpha Corvi system on December 3rd, 2525.
The Battle of Bliss was a Covenant attack on the outer colony world of Bliss on February 13th, 2526.
The Second Battle of Harvest, also known as just simply the Battle of Harvest, was humanities first attempt to recover the planet Harvest from the Covenant, who wiped out the existing colony and killed tens of thousands of civilians a year earlier.
The Harvest Campaign was a five-year campaign to retake the planet Harvest after the Covenant took over the planet and wiped out the colony on Harvest.
Operation: SILENT STORM was a UNSC operation to use EVA tactics to infiltrate Covenant vessels and either capture or destroy them from within early in the Human-Covenant War in March and April 2526.
The Battle of Circinius IV was a Covenant attack on the planet Circinius IV and Corbulo Military Academy located on the planet.
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 of Netherop was a conflict between UNSC forces led by Spartan-II Blue Team and Covenant forces on the uninhabited hothouse world in June 2526.
The Battle of Alpha Aurigae was a large naval battle between UNSC and Covenant forces in the Origami Asteroid Field of the Alpha Aurigae system, culminating in a UNSC victory.
The Fall of Madrigal was an early battle in the Human-Covenant War, occurring on and around the planet Madrigal in the 23 Librae system.
The Battle of Hat Yai was a battle early in the Human-Covenant War that took place between late 2528 and early 2529.
Sometime in 2530 the colony world of Eridanus II, home world of John-117, was glassed by an unknown Covenant force.
The Battle of the Great Bear was a naval battle between a UNSC fleet of seventeen warships and three Covenant warships in the Groombridge-1830 system.
The Battle for Arcadia was a battle for the colony Arcadia in the Procyon system, which occurred in the immediate aftermath of the Harvest Campaign.
The Battle of Jericho VII was a three-day naval and ground battle pitting the UNSC versus the Covenant forces in the Lambda Serpentis system.
The Battle of Charybdis IX was a Covenant assault on the planet Charybdis IX in the Charybdis system sometime in 2535, prior to the Battle of the Rubble.
The Battle of the Rubble was a battle that took place in the 23 Librae system on a grouping of Lagrangian asteroids trailing Hesiod, a gas giant in the system, some time around 2535.
The Battle of Metisette occurred in the immediate aftermath of the Battle of the Rubble in 2535, taking place on Metisette, the nearby moon of the gas giant Hesiod.
The Battle of New Constantinople was a large conflict between UNSC and Covenant forces that took place some time in early 2537 on the colony of New Constantinople.
The Battle of Meridian was a three-year conflict between the Covenant and UNSC forces on and around the colony world of Meridian, a moon around Hestia V in the Hestia system, between 2548 and 2551.
The Fall of Arcadia, also known as the Second Fall of Arcadia, was a Covenant invasion and subsequent loss of the colony world of Arcadia in the Procyon system on September 9th 2549.
The Glassing of Minab was a Covenant attack on the outer colony world of Minab in 2550.
The Battle of New Jerusalem was a Covenant attack on the colony of New Jerusalem in the Cygnus system sometime in July or August 2552.
Operation: JOVIAN WHISTLE was an operation executed by the UNSC 717th Xeno-Materials Exploitation Battalion to recover a Forerunner ancilla on the human colony world of Gao in the Cordoba system in the early summer 2553.
Operation: COALPEPPER was an ONI and Spartan operation to rescue Sadie Endesha and the Huragok Quick to Adjust to whom she was assigned from the United Rebel Front on the moon of Talitsa in the Sverdlovsk system in August 2555.
The Sedra City Mall Bombing was a terrorist attack on the human colony world of Sedra in the Orrichon system by an unknown Sangheili terrorist organization in February 2556.
The Mission to Cleyell was a UNSC mission to the colony world of Cleyell, which had recently been glassed by a fringe group of Covenant remnants sometime in 2556.
The Raid on the Biko Peace Talks was an attempted terrorist attack on peace talks between the Unified Earth Government and Sangheili on the colony world of Biko in March 2558.
The Carrow Conflict was a conflict between human, Sangheili, and Jiralhanae forces in the Joint Occupation Zone on the planet of Carrow in September 2558.
The Second Battle of Meridian was a conflict between the colonists of Meridian funded by the Liang-Dortmund Corporation, the UNSC, and Prometheans under control of Cortana on October 25th, 2558.
