M42.120 - The Invasion Begins

Vaxxos the Deceiver identifies Duros IV as a strategically vital world with rich resources and a weakened Imperial presence due to ongoing conflicts elsewhere.
  The Vengeful Despoilers launch their initial invasion, targeting the planetary capital, Argentum, and key industrial centers. They deploy their full array of forces, including traitor guardsmen, Chaos Space Marines, and daemon engines.
  Initial strikes are focused on disabling planetary defenses and sowing chaos among the Imperial forces, with the warband's Alpha Legion contingent conducting infiltration and sabotage missions.