The fleet saw little activity in September, and during this period, the Grand Fleet began to go to sea without the 3rd Battle Squadron. On 29 April 1916, the 3rd Battle Squadron was rebased at Sheerness, and on 3 May 1916 it was separated from the Grand Fleet, being transferred to the Nore Command. "Commonwealth" remained there with the squadron until August 1917. "Commonwealth" left the 3rd Battle Squadron in August 1917 and paid off to undergo an extensive refit at Portsmouth Dockyard, during which she became the only "King Edward VII"-class ship fitted with updated features common among dreadnoughts, including torpedo bulges, a tripod foremast, and a director and fire control system; she also had her 6-inch gun batteries removed and four 6-inch guns installed one deck higher.