The First Battle of Paramar was a major campaign fought during the opening days of the Horus Heresy in 006.M31 that saw the invasion of the vitally strategic Imperial world of Paramar V and the eventual conquest of the Paramar System by the Traitor Astartes of the Alpha Legion and the forces of the Warmaster Horus. Typical of the Alpha Legion's tactics, the conflict on Paramar V was a cold, calculated campaign both intricate in its complexity and ruthless in its execution.