In the closing years of the War he served as Commander-in-Chief of the Mediterranean Fleet, in which capacity he signed the Armistice of Mudros on behalf of all the Allies, by which the Ottoman Empire accepted defeat and ceased hostilities.

[4] Promoted to midshipman on 19 March 1880, he was appointed to the armoured cruiser HMS Northampton, flagship of the North America and West Indies Station later that year.

[4] He became torpedo officer in the cruiser HMS St George on the Cape of Good Hope and West Coast of Africa Station in October 1894 and saw action with naval brigades during the Fourth Anglo-Ashanti War.

[4] Promoted to commander on 1 January 1896,[5] Gough-Calthorpe became Executive Officer in the armoured cruiser HMS Imperieuse, flagship of the Pacific Station, in March 1896.

[12] Promoted to rear admiral on 27 August 1911[13] and, having been appointed a Companion of the Order of the Bath on 27 September 1912,[14] he became second-in-command of the 1st Battle Squadron, with his flag in the battleship HMS St Vincent, in December 1912.

[6] Georges Clemenceau, Prime Minister of France, complained that Admiral Dominique-Marie Gauchet had not been present at the treaty signing but the British Government gave Gough-Calthorpe its full backing.

[24] Promoted to Admiral of the Fleet on 8 May 1925,[25] he retired in May 1930 and, having been appointed a Deputy Lieutenant for Southampton on 26 March 1932,[26] died at his home in Ryde on the Isle of Wight on 27 July 1937.