Editing Hugh Trevor-Roper (section)

==Military service and the Second World War==
Trevor-Roper was a member of the University of Oxford's [[Officer Training Corps]], reaching the rank of [[officer cadet]] [[corporal]].<ref name="LG 10 March 1939">{{London Gazette |issue= 34606 |date= 10 March 1939 |page= 1640 |supp= }}</ref> On 28 February 1939, he was commissioned in the [[British Army]] as a [[second lieutenant]] with seniority in that rank from 1 October 1938, and attached to the cavalry unit of the Oxford University Contingent of the OTC.<ref name="LG 10 March 1939" /> On 15 July 1940, he was promoted to [[war substantive]] [[Lieutenant (British Army and Royal Marines)|lieutenant]] and transferred to the [[Intelligence Corps (United Kingdom)|Intelligence Corps]], [[Territorial Army (United Kingdom)|Territorial Army]].<ref name="LG 7 March 1941">{{London Gazette |issue= 35099 |date= 7 March 1941 |page= 1436 |supp= y }}</ref>

During the [[Second World War]], he served as an officer in the Radio Security Service of the [[Secret Intelligence Service]], and then on the interception of messages from the German intelligence service, the ''[[Abwehr]]''.<ref name="J. Winter 2007 pp 847">P. R. J. Winter, "A Higher Form of Intelligence: Hugh Trevor-Roper and Wartime British Secret Service," ''Intelligence & National Security'' (Dec 2007), 22#6 pp 847–80,</ref> In early 1940, Trevor-Roper and [[E. W. B. Gill]] decrypted some of these intercepts, demonstrating the relevance of the material and spurring [[Bletchley Park]] efforts to decrypt the traffic. Intelligence from ''Abwehr'' traffic later played an important part in many operations including the [[Double-Cross System]].<ref>{{cite book |last=Batey |first=Keith |author-link=Keith Batey |editor-first=Ralph |editor-last=Erskine |editor2-last=Smith |editor2-first=Michael |editor2-link=Michael Smith (newspaper reporter) |title=The Bletchley Park Codebreakers |publisher=Biteback Publishing |year=2011 |pages=35–39 |chapter=Chapter 17: How Dilly Knox and His Girls Broke the Abwehr Enigma |isbn=978-1849540780 }} (Updated and extended version of ''Action This Day: From Breaking of the Enigma Code to the Birth of the Modern Computer'' Bantam Press 2001)</ref>

He formed a low opinion of most pre-war professional intelligence officers, but a higher one of some of the post-1939 recruits. In ''The Philby Affair'' (1968) Trevor-Roper argues that the Soviet spy [[Kim Philby]] was never in a position to undermine efforts by the chief of the ''Abwehr'', German Military Intelligence, [[Admiral]] [[Wilhelm Canaris]], to overthrow the Nazi regime and negotiate with the British government.<ref name="J. Winter 2007 pp 847"/>