Walkthroughs For Xbox360 Games: Halo: Combat Evolved Walkthroughs

The year is 2552. Light travel is now a reality. Earth still exists, but millions of humans now live on habitable planets in other solar systems because of overpopulation. A keystone of humanity’s colonization efforts is the planet Reach, an interstellar naval yard that builds colony ships for civilians and warships for the UNSC’s armed forces and conveniently located near Earth. Reach is also a hub of scientific and military activity.Thirty-two years ago, contact with the outer colony Harvest was lost. A battlegroup sent to investigate was almost completely destroyed. Only one badly damaged ship returned to Reach. Its crew told of a seemingly unstoppable alien warship that had effortlessly annihilated their forces. A group of aliens they eventually came to know as the Covenant. A collective of alien races united in their fanatical religious devotion. Covenant religious elders declared humanity an affront to the gods, and the Covenant warrior caste waged a holy war upon humanity with gruesome diligence.
On Reach, existing SPARTAN-II soldiers are recalled to Reach for further augmentation. The plan: board a Covenant vessel with the improved SPARTAN-IIs and learn the location of the Covenant home world. Two days before the mission begins, Covenant forces strike Reach and annihilate the colony. The Covenant are now on Earth’s doorstep. One ship, the Pillar of
Autumn, escapes with the last SPARTAN-II and makes a blind jump into deep space, hoping to lead the Covenant away from Earth.
source:- Bungie's Halo Manual

The Pillar of Autumn