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Sir Francis Harry Hinsley, (26 November 1918 – 16 February 1998) was an English intelligence officer and historian. He worked at Bletchley Park during the Second World War and wrote widely on the history of international relations and British Intelligence during the Second World War. He was known as Harry Hinsley.
In August 1939, Hinsley visited his girlfriend in the German city of Koblenz. Police required him to report to the police station daily. However, this requirement was waived following the signing of the German-Soviet Pact. A week later, Hinsley was advised by police via his girlfriend's parents to get out of Nazi Germany by "tomorrow at the latest". This enabled him to cross the Franco-German border before it was closed. He made the crossing at the bridge between Kehl and Strasbourg. Stripped of his by German border guards without French franc or Pound sterling in exchange, Hinsley was left penniless. This led to his sleeping on a park bench in France. Hinsley Hitchhiking to Switzerland from where he returned to the United Kingdom. He made his return just before Britain declared war on Germany. In October 1939, while still at St. John's, he was summoned to an interview with Alastair Denniston, head of the Government Code and Cypher School (GC&CS), and was thereby recruited to Bletchley Park's naval section in Hut 4.Kahn, 1991, p. 120 He abandoned his degree course and thereafter never completed it.
Hinsley helped initiate a programme of seizing and keys from German , such as the Lauenburg, thereby facilitating Bletchley Park's resumption of interrupted breaking of German Naval Enigma. He realised that, as the ships were on station for long periods, they would have to carry the code books (which changed every month) for subsequent months; these would likely be in a locked safe and might be overlooked when the crew threw Enigma materials (including the code book currently in use) overboard if the ship was boarded, an assumption which proved correct.Dr. Mark Baldwin, "The Enigma Machine", presentation to the BCS Tayside & Fife Branch, Abertay University, 26 August 2019
In late 1943, Hinsley was sent to liaise with the US Navy in Washington, with the result that an agreement was reached in January 1944 to co-operate in exchanging results on Japanese Naval signals.Michael Smith, "How the British Broke Japan's Codes", p. 148 in Action this Day, edited by Ralph Erskine and Michael Smith, 2001
Towards the end of the war, Hinsley, by then a key aide to Bletchley Park chief Edward Travis, was part of a committee which argued for a post-war intelligence agency that would combine both signals intelligence and human intelligence in a single organisation. In the event, the opposite occurred, with GC&CS becoming GCHQ.Michael Smith, prefatory remarks to Richard J. Aldrich, "Cold War Codebreaking and Beyond: The Legacy of Bletchley Park", p. 403 in Action this Day, edited by Ralph Erskine and Michael Smith, 2001
On 6 April 1946, Hinsley married Hilary Brett-Smith, a graduate from Somerville College, Oxford, who had also worked at Bletchley Park, in Hut 8. They moved to Cambridge after the war where Hinsley had been elected a Fellow at St. John's College.
Hinsley was awarded the OBE in 1946 and was knighted in 1985.
On his death, Sir Harry Hinsley was cremated and his family buried the ashes privately in Cambridge.
In 1962, Hinsley published Power and the Pursuit of Peace, which is important as a study of early idealist thought about international relations.Cambridge: Cambridge University Press, 1962.
Hinsley edited the multi-volume official history British Intelligence in the Second World War and argued that Enigma decryption had speeded Allied victory by one to four years but had not fundamentally altered the war's outcome.
He was criticised by Marian RejewskiMarian Rejewski, "Remarks on Appendix 1 to British Intelligence in the Second World War by F. H. Hinsley," translated by Christopher Kasparek, Cryptologia, vol. 6, no. 1 (January 1982), pp. 75–83. and Gordon Welchman,Gordon Welchman, "From Polish Bomba to British Bombe: the Birth of Ultra," Intelligence and National Security, vol. 1, no. 1, 1986, pp. 71–110. who took exception to inaccuracies in Hinsley's accounts of the history of Enigma decryption in the early volumes of his official history, including crucial errors in chronology. Subsequently, a revised account of the Polish, French and British contribution was included in Volume 3, Part 2.
The following volumes of British Intelligence in the Second World War were edited by Hinsley and published by Her Majesty's Stationery Office (HMSO) London:
Hinsley also co-edited (with Alan Stripp) and contributed to Codebreakers: The Inside Story of Bletchley Park, which contains personal accounts from those who worked at Bletchley Park.
The Hinsley Memorial Lecture, an annual lecture on an international relations topic, is held every year at St John's College in memory of Hinsley.
He is commemorated by a blue plaque on his birthplace in Walsall.
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