 Complete the following phrase:  After returning to the North Sea, the ships of IV Scouting Group took part in a series of fleet advances, all of which failed to locate British vessels. These took place on 17 and 2930 May and 1112 September. München was dry-docked from 24 September to 31 October for periodic maintece. She was temporarily transferred back to the Baltic on 18 January 1916. While en route from Kiel to Libau, she collided with the freighter Moskau off Rixhöft. Münchens port side was badly damaged in the accident, and had to be dry-docked at the in Danzig for repairs that lasted until 6 March. She was thereafter ordered to return to the North Sea, arriving there four days later. The ship joined the fleet for an uneventful sortie on 25 March to the Amrum Bank. Another major operation against the British coast began on 24 April; the main fleet again covered I Scouting Group 