Human-Forerunner wars

"Ten thousand years ago, humans had fought a war against Forerunners—and lost. The centers of human civilization had been dismantled and the humans themselves devolved and shattered into many forms, some said as punishment—but more likely because they were a naturally violent species."

- Bornstellar, c. 100,000 B.C.E.

The Human-Forerunner War was a major interstellar conflict fought approximately in 110,000 B.C. in the Orion arm of the Milky Way galaxy. This was the first recorded war in human history, and was fought against overwhelming fleets and armies of the Forerunners.

Aftermath
The victorious Forerunners decided to dismantle every piece of pre-historic human civilization, causing the species to devolve on their own. Because of this cataclysmic event, humanity splintered into many species, including the Florians. This was noted as being a "punishment" by a Forerunner Miner, Bornstellar Makes Eternal Lasting ten thousand years later.

List of appearances

 * Forerunner Saga
 * Halo: Cryptum

Internal

 * Humans
 * Forerunners
 * Erde-Tyrene

External

 * Tor.com — Halo: Cryptum chapter one excerpt