Marrack was promoted to midshipman on 15 July 1904, and on 20 May 1908 ActingSub-lieutenant Marrack was confirmed in his rank with seniority from 15 October 1907. After serving for a short time aboard the battleship, Marrack joined the Submarine Branch of the Royal Navy, and on 15 August 1908 was appointed to the submarine depot ship at Portsmouth 'for Instruction in Submarine Boats'. In August 1909 he was transferred to the submarine depot ship at Queenstown 'for Submarines'. Marrack was promoted to lieutenant on 30 June 1910. On 26 October 1911 Marrack was appointed to at Devonport to take command of the submarine, then serving as commander of into 1912. On 15 August 1912 he was appointed to submarine tender at Dundee to command. Marrack remained in command of C19 after the outbreak of World War I, based at various ports, until 1 December 1916 when he was appointed to at Harwich to command. In mid-April 1918 Marrack was awarded the Distinguished Service Cross, and was promoted to lieutenant commander on 30 June 1918. After the armistice in November 1918 Marrack remained in command of E51going to then command the submarines, and. On 14 April 1923 he was appointed to command of, the depot ship of the Periscope School at Portland, and on 30 June was promoted to commander. Marrack was 'loaned' to the Royal Australian Navy on 1 April 1927 to command the submarine HMAS Oxley, until 5 September 1928. On 26 March 1929 he was appointed to command of the submarine depot ship and the 6th Submarine Flotilla at Portsmouth, moving his command to the depot ship on 1 October 1930, and being promoted to captain on 31 December 1930. On 2 February 1931 Marrack was appointed to command of the submarine depot ship and of the 4th Submarine Flotilla on the China Station. From 5 May to 3 June 1933 Marrack was Commodore-in-Charge of Naval Establishments at Hong Kong with the temporary rank of commodore, 2nd class He then returned to England to attend the senior officers' war course at the RN War College, Greenwich, as well as the tactical course, at HM Dockyard, Portsmouth, before being appointed to command of the light cruiser on 5 September 1934, as part of the 6th Cruiser Squadron on the Africa Station, serving until mid-1937 when his ship returned to England to refit. Marrack then served as Captain Superintendent of HM Dockyard Sheerness, and, from 12 December 1939, as Commodore-in-Charge, until 15 January 1941 when he was promoted to rear admiral and the following day placed on the Retired List. However, despite this Marrack remained in active service, being made a Commander of the Order of the British Empire in the Birthday Honours of 2 June 1943, and serving as Commodore Superintendent at Gibraltar Dockyard from 1943 until the end of the war in 1945.
Personal life
Marrack married Christine Banbury Pilkington at the Old Parish Church in Upper Dovercourt on 7 July 1917. Christine Pilkington was the widow of Lieutenant George Pilkington who died when was lost on 7 January 1915. They had no children. Rear Admiral Marrack died in the Royal Naval Hospital at Haslar on 12 February 1972.
Papers
The Imperial War Museum in London holds the papers of Rear Admiral Hugh Marrack 1932–1937, including his account of the seizure of the Chinese quarter of Shanghai by the Chinese Nationalist Army led by General Chiang Kai-shek in April 1927 ; an account of his service as Commanding Officer, HMS Carlisle, Africa Station 1934–1937; an account of a visit of Carlisle to Tristan da Cunha in 1937; and two files of papers relating to submarines.
