A timeline of all major events in the Halo universe from the time of the Forerunners through the rule of the Created.
Spartan-III Alpha company was the first of three Spartan-III companies to be recruited, trained, and put into service.
Spartan-III Beta company was the second of three Spartan-III companies to be recruited, trained, and put into service.
Spartan-III Gamma Company was the last of three Spartan-III companies to be recruited, trained, and put into service.
The Onyx Conflict was a major engagement between UNSC, Covenant, and Forerunner forces on and around the planet of Onyx in the Zeta Doradus system in October and November 2552.
