Richmond joined the Royal Navy as a cadet in 1885, serving on the Australian Station and in the Hydrographic Service before qualifying as a torpedo officer in 1897. He began to develop a serious interest in naval history while serving in in 1897–98, in 1899, and in 1899–1900, turning himself into a first-rate historian without formal university training. In 1900–1902 Richmond served in the flagship of the Channel Fleet . Promoted to
commander on 1 January 1903, he was later the same month appointed to the
Naval Ordnance Department as an assistant to the
Director of Naval Ordnance. In February 1904 he became first officer in , flagship of the
Cape of Good Hope Station. He was assigned to the Admiralty in 1906–08, where he served briefly as naval assistant to Admiral
John Fisher, 1st Baron Fisher. In 1907, inspired by the work of civilian naval historian
Julian Corbett, Richmond began archive research concerning the naval aspects of the
War of the Austrian Succession, which he completed in 1914, but which was not published until 1920 due to the First World War. Promoted to captain, Richmond commanded from 1909 to 1911, then, in 1911–12, the
Torpedo School, training ships and . In 1912 he founded the
Naval Review in order to promote innovative thought within the Royal Navy. In 1913 Richmond became assistant director of operations on the Admiralty's Naval Staff, where his frequent memoranda about deficiencies in naval strategy drew the disdain of First Lord of the Admiralty
Winston Churchill, and when events proved him right, he was shoveled off as a liaison officer to the Italian Fleet in April 1915, returning from
Taranto in September 1915. After this he was given a backwater assignment, command of (part of a
pre-dreadnought battle squadron at
the Nore) in 1916. After the disappointing 31 May – 1 June 1916
Battle of Jutland resulted in the appointment of his admirer Admiral
David Beatty as Grand Fleet CIC in December 1916, assisted by his memorandums that predicted the beginning of
unrestricted submarine warfare by Germany beginning 1 February 1917, he received command of in the Grand Fleet in April 1917, after which he served as director of staff duties and training in 1918, then commanded in 1919. In early 1917 Richmond lobbied hard for convoy protection of merchant shipping in the
North Sea, but the Admiralty resisted despite mounting losses, waiting until the end of April to experiment. On 17 May 1917 Richmond's friend, Lieutenant
Joseph M. Kenworthy had a meeting with British Prime Minister
Lloyd George, in which he recommended that Richmond be appointed to his cabinet, to which Lloyd George replied "I have put his name to the Admiralty and they tell me he is only a paper man". On 20 May he met with him again, pressing him to no avail, with Lloyd George saying "If you could put a captain in a sufficiently strong position, Richmond is the man"; nothing came of it.
Flag officer Promoted to rear admiral, Richmond was put in charge of the Senior Officers' Course at the
Royal Naval College, Greenwich in 1920, which office was merged with the Presidency of the Royal Naval College itself in November 1922. In October 1923 he was assigned as commander-in-chief,
East Indies Squadron. Promoted to vice admiral in 1925, he was created a
Knight Commander of the Order of the Bath in the
1926 Birthday Honours. Returning to London in 1927, he became
Commandant of the Imperial Defence College. In 1929 he was promoted to admiral and served as president of the
International Conference on the Safety of Life at Sea. ==Academic career==