A timeline of all major events in the Halo universe from the time of the Forerunners through the rule of the Created.
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 the Etran Harborage was a battle between the UNSC Spirit of Fire and Covenant forces lead by Arbiter Ripa 'Moramee on Shield World 0459, also known as the Etran Harborage.
Operation: SMOKING ACES was a raid by Spartan-II Blue Team on an Insurrection stronghold in the 111 Tauri system.
Spartan-III Alpha company was the first of three Spartan-III companies to be recruited, trained, and put into service.
In an effort to limit the ability for the Covenant to discover human colonies, including the inner colonies and Earth, the Cole Protocol was established to wipe all ship navigation data when the UNSC came into contact with any Covenant forces.
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 Leonis Minoris was a battle between Covenant and UNSC forces in the Leonis Minoris system sometime in 2537.
The Battle of New Harmony was an assault on the colony New Harmony by Covenant forces in early 2537.
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.
Operation: PROMETHEUS was an assault on a Covenant shipyard located on and around asteroid K7-49 by Spartan-III Alpha Company.
The Battle of Kholo was a Covenant assault on the human colony world of Kholo sometime in 2539.
Spartan-III Beta company was the second of three Spartan-III companies to be recruited, trained, and put into service.
