Educated at
Harrow School and the
Royal Military College, Sandhurst, Sixsmith was commissioned into the
Cameronians (Scottish Rifles) on 27 August 1924. He commanded the 2nd Battalion,
Royal Scots Fusiliers in
Italy and then the 2nd Battalion, Cameronians (Scottish Rifles) in Italy and then became Deputy Director of Staff Duties at the
War Office during the
Second World War. After the war he became Deputy Director of Personnel Administration at the War Office in January 1948, Chief of Staff and Deputy Commander,
British Forces in Hong Kong in January 1952 and Chief of Staff for
Far East Land Forces in April 1952. After that he became General Officer Commanding
43rd (Wessex) Infantry Division in September 1954 and Assistant Chief of Staff, Organization and Training at
Supreme Headquarters Allied Powers Europe in November 1957 before retiring in January 1961. advanced to
Commander of the Order of the British Empire in
1946 Birthday Honours and appointed and a
Companion of the Order of the Bath in the
1951 Birthday Honours. ==Works==