Keppel, second-in-command of the Atlantic Fleet, in September 1909 and then Flag Captain of the battleship HMS London, Keppel's new flagship in the same role, in February 1910. After attending the War course at the Royal Naval War College at Portsmouth, he served as Captain of the converted liner RMS Medina for the Royal Tour of India in 1911 and was appointed to the Royal Victorian Order as a Commander in February 1912. He was then given command first of HMS Aboukir in the Reserve Fleet in Summer 1912, then of the cruiser HMS Southampton in September 1912 and subsequently of the battlecruiser HMS Lion, flagship of Rear-Admiral David Beatty's First Battlecruiser Squadron, in March 1913. First World War During the First World War Chatfield was present as Beatty's Flag-Captain in the Lion at the Battle of Heligoland Bight in August 1914, at the Battle of Dogger Bank in January 1915 and at the Battle of Jutland in May 1916. It was at Jutland, after two British battlecruisers had blown up, that Beatty made his famous remark, "There seems to be something wrong with our bloody ships today". Appointed to the Order of St Michael and St George as a Companion on 31 May 1916 and to the Order of the Bath as a Companion in the 1916 Birthday Honours, Chatfield went on to command the battleship HMS Iron Duke, Beatty's flagship as Commander-in-Chief of the Grand Fleet, in November 1916 and then the battleship , Beatty's new flagship in the same role, in February 1917. He was advanced to Knight Commander of the Order of St Michael and St George on 5 April 1919. Senior command After the war Chatfield served as Fourth Sea Lord from July 1919 and, having been appointed Naval Aide-de-Camp to the King on 26 January 1920 and promoted to rear-admiral on 31 July 1920, he became Assistant Chief of the Naval Staff in February 1920. Advanced to Knight Commander of the Order of the Bath in the 1922 Birthday Honours, he was appointed Commander of the 3rd Light Cruiser Squadron in September 1922 and Third Sea Lord and Controller of the Navy in April 1925. Promoted to vice-admiral on 1 March 1926, he went on to be Commander-in-Chief, Atlantic Fleet, with his flag in the battleship HMS Nelson, in March 1929 and, having been promoted to full admiral on 1 April 1930, he became