 Appointed a Knight Commander of the Royal Victorian Order on 9 November 1906, he became Commander of the 6th Cruiser Squadron in the Mediterranean Fleet, hoisting his flag in the armoured cruiser HMS "Bacchante", in October 1908.He was awarded the Grand Cross of the Spanish Order of Naval Merit on the occasion of the visit of his flagship to Valencia in May 1909.Jackson was promoted to vice admiral on 15 March 1911 on appointment as Director of the Royal Naval War College.