One of the planet-sized factories where the war machines for humanity’s never-ending struggle for existence are built has been attacked by a horde of millions of Orks. Losing this planet is not an option, and you should be aware of the far greater threat that lurks in the darkness of this planet.

Guides
Warhammer 40,000: Space Marine – Multiplayer Guide for Beginners
This guide is meant to help players that are new to multiplayer Space Marine, as in people who have already beaten or at least played much of the single player […]