Outriders were a type of specialist Space Marine squad used during the Great Crusade and Horus Heresy.
These were specialized and mechanized reconnaissance squads commonly transported in Bikes and scramblers designed for use on rugged terrain. Used primarily for rapid encirclement and hit-and-run attacks, the chief advantage of Outriders is speed and the ability to go where heavier vehicles could not.[1]
Sources
- 1: The Horus Heresy Book One - Betrayal, pg. 211
- 2: Forge World (last accessed 7 June 2015)