An unanticipated assault transpired within the Valo system, targeting the military personnel of the Alliance to Restore the Republic and executed by the Galactic Empire. Lyle Kullan, an operative working for the Empire, had successfully embedded himself within the Rebel Alliance's Rogue Squadron with the objective of apprehending Commander Luke Skywalker. Their initial endeavor was unsuccessful at the Taris shipyards, resulting in the destruction of the entire installation. Subsequently, after strategically deploying a distress signal inside the Valo system, Rogue Squadron mobilized to provide assistance to Kullan. Upon their arrival, they encountered three Imperial II-class Star Destroyers under the command of Commander Calister. Subsequent to the entrance of Alliance Fleet reinforcements, the Imperial warships were forced to withdraw, suffering a loss.