Before any Space Marine chapter would risk jump into an enemy held airspace, some sort of reconnaissance would need to be done else disaster would ensue. Since the Dark Angels had no significant support fleet, no other ships but their cruiser, the Repraehender, a probe was launched to do this work.

“Captain, the probe has entered the planet’s proximity. We are receiving data on Septimus Quadraticus Sistema IV Alpha-VII Principale,” one of the numerous chapter aides reported.