sentences:  He was promoted to commander on 31 December 1936.The following month, he assumed command of the newly commissioned "Grimsby"-class sloop , carrying out duties in the South West Pacific.Completing his tenure on "Swan" in January 1939, he was briefly assigned to the Navy Office, Melbourne, before returning to Britain in March for duty at HMS "Pembroke", awaiting posting aboard the yet-to-be-commissioned anti-aircraft cruiser, .