 "Regensburg" completed her trials on 10 March 1915, and was then assigned to the II Scouting Group.Eleven days later, she bombarded Russian positions near Polangen and Papensee; the operation lasted until the 24th.Captain Hans Zenker proposed that "Regensburg" and the liner "Cap Polonio"—which was to be armed with 15 cm guns—should be sent out into the Atlantic to replace the commerce raiding cruisers that had been destroyed in the early months of the war.