'''Operation Thunderstorm''' was the ''Expeditio Reclamatus'' to find and retrieve the wreckage of [[Commissar Yarrick]]'s personal [[Baneblade]], the ''[[Fortress of Arrogance]]'', from the [[Ork World]] of [[Golgotha]], in or around 998.[[M41]], shortly before the outbreak of the [[Third War for Armageddon]]. Yarrick and the [[Departmento Munitorum]] believed that the famous tank would be a much-needed boost to morale for the Imperial forces defending [[Armageddon]] from [[Waaagh!]] [[Ghazghkull]].