How Did the Fall of Reach Happen?: The Opening Days
Although the original novel depicted Reach’s invasion as taking place in a very short period of time, Halo: Reach reframed the Covenant’s discovery, invasion, and eventual destruction of Reach as taking place over the course of a month. The Covenant’s infiltration of Reach began slowly and secretively—with its fleet undetected by the UNSC, small groups of advance scout teams targeted and disrupted communications across the world, preparing it for wider invasion.
Initially believed by the UNSC as potential insurrectionist activity on the world, the initial discovery of a Covenant presence on Reach during the battle of Visegrád, a town home to a major comms relay, saw the UNSC declare Winter Contingency in late June 2552. The failsafe backup plan was designed to mobilize military forces upon discovery that the Covenant had become aware of one of humanity’s colonies.
