 They were tasked with replacing the heavy units of the fleet that had just completed Operation Albion, the conquest of the islands in the Gulf of Riga, along with the battleships of the I Battle Squadron.The risk of mines that had come loose in a recent storm, however, prompted the naval command to cancel the mission, and "Regensburg" and the rest of the IV Scouting Group was ordered to return to the North Sea on 31 October.By October 1918, "Regensburg" was serving as the flagship of Commodore Johannes von Karpf, commander of the IV Scouting Group.