 Complete the following phrase:  By the end of August, Rheinland and the rest of the High Seas Fleet units were back in their bases on the North Sea. The next operation conducted was a sweep into the North Sea on 1112 September, though it ended without any action. Another sortie followed on 2324 October during which the German fleet did not encounter any British forces. On 12 February 1916, Rheinland was sent to the dockyard for an extensive overhaul, which lasted until 19 April. Rheinland was back with the fleet in time to participate in another advance into the North Sea on 2122 April. Another bombardment mission followed two days later; Rheinland was part of the battleship support for the I Scouting Group battlecruisers that 