Temporal Wars

The Temporal Wars was an Imperial castigation conducted by the Sons of Iron Space Marine Chapter to cleanse the worlds of the Ougrean Rift of the Forces of Chaos and various renegades following the formation of the Cicatrix Maledictum during the 13th Black Crusade.

Background
The whole Ougrean Rift had been trapped into temporal anomalies. Still, the Sons of Iron plunged into the fight, cleansing worlds after worlds from Chaos cultists and pirates, who sometimes believed that thousands of years had gone by in the blink of an eye. Many of the Chapter's best fell during those campaigns, such as Alvar Hagström, intombed into a Dreadnought after waging war on Torndheim IV for what had been two weeks of standard time and four centuries on the cursed world, or Septus Orth, who died on the world of Lorea, surrounded by hundreds of traitors. When time returned to normal, the whole Rift was into the hands of the Imperium, and the Sons now had far more gene-seeds than ever, both normal and Primaris, allowing for quick recovery of manpower.