First Battle of Installation 01

The First Battle of Installation 01 was an engagement of the Forefather War. It took place between the Eleventh and the Seventeenth of December, 2560.

Background
In early December of 2560, the S'southi military leader Sark was informed of the existence of the Halo array by Binding Enlightenment, their "god" and leader of the Forefathers. Binding Enlightenment did not know the location of each ring, only that of Installation 01 through the usage of the Luminary on Propriety, and delivered orders to Sark to travel to the ring.

Installation 01, and the other rings in the array, were of great importance to the Forefathers, and by extension, the S'southi, as the Forefathers wished to use them to "gain their ultimate revenge against the sons and daughters of the Forerunners", and sought to fire the entire array and purge the Milky Way of life.

The S'southi arrived at Installation 01 on the Ninth of December, and they began attempts to search for the sacred icon. Upon the realisation that the Installation's monitor, a Forerunner construct, was still active, Binding Enlightenment became blinded by rampant rage and ordered Sark to destroy all active constructs on the ring, including the Sentinels. The ensuing battle between the S'southi and the Sentinels bogged the S'southi down and prevented them from locating the index. The monitor, 001 Anguished Deliberation, would send an urgent communication to the array and the Lesser Ark, informing them of the threat currently posed to the installation.

Human scientists on Installation 03 reported these communications to the Galactic Alliance, which dispatched a sizable military force, primarily consisting of starships, to Installation 01. They would arrive on the Eleventh of December.