Jones served in the Second World War, initially as brigade major for the 127th Infantry Brigade, which formed part of the British Expeditionary Force dispatched to France and Belgium in 1940.[1] He was an Instructor at the Staff College from 1940 to 1941, when he became a general staff officer at General Headquarters Home Forces.[1] In 1943 he was appointed Commander Royal Engineers for the Guards Armoured Division.[1] He became Chief of Staff Malaya Command in 1945 and then brigadier on the general staff of 30 Corps in North West Europe in 1945.[1]