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 Camber was an invasion of the colony world of Camber sometime between 2535 and 2552.

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.

The Battle for Alluvion was a major conflict in the Human-Covenant War that took place in the Bhaakto system some time in 2542.

The Battle of Psi Serpentis was a major conflict between a UNSC fleet of 162 warships led by the UNSC Everest and Admiral Preston Cole and two fleets of Covenant warships totaling over 300 ships in the Psi Serpentis system in April 2543.

The Battle of Miridem was an engagement between human and Covenant forces on and around the colony of Miridem.

The flagship of the UNSC Navy and the first Infinity-class supercarrier ever constructed, the UNSC Infinity is the largest single human warship ever constructed, with a crew of over 17,000.

Operation: IRON FIST was a military operation on the colony of Miridem after the Battle of Miridem in 2544 and prior to the colony's glassing.

Spartan-III Gamma Company was the last of three Spartan-III companies to be recruited, trained, and put into service.

The Invasion of Draco III was a Covenant attack on the colony world of Draco III in January 2545.

The Battle of Actium was an invasion by Covenant forces on the colony world Actium in May 2545.

The Battle of New Llanelli was an engagement between UNSC and Covenant forces on the colony world of New Llanelli in the Brunel system, sometime in 2546.

The Battle of Skopje was a conflict between the Covenant and UNSC forces on the colony world of Skopje, sometime in 2547.

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 Siege of Paris IV was a major battle between the UNSC and Covenant forces on and around the colony of Paris IV in the Paris system in 2549.

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.