9781526730800 - codebreakers di twigge, stephen (24 risultati)
Lingua: Inglese
Editore: Pen and Sword History, 2020
- Brossura
Da: PlumCircle, West Mifflin, PA, U.S.A.PlumCircle
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 1,19
EUR 4,31 spedizioneSpedito in U.S.A.Quantità: 13 disponibili
paperback. Condizione: New. New item in gift quality condition. 99% of orders arrive in 4-10 days. Discounted shipping on multiple books.
Lingua: Inglese
Editore: Pen and Sword History, 2020
- Brossura
Da: PlumCircle, West Mifflin, PA, U.S.A.PlumCircle
Contatta il venditoreVenditore con 5 stelleCondizione: Usato - Ottimo
EUR 1,19
EUR 4,31 spedizioneSpedito in U.S.A.Quantità: 3 disponibili
paperback. Condizione: Fine. Publisher overstock. May have remainder mark / minimal shelfwear. 99% of orders arrive in 4-10 days. Discounted shipping on multiple books.
Lingua: Inglese
Editore: Pen and Sword History, 2020
- Brossura
Da: The Maryland Book Bank, Baltimore, MD, U.S.A.The Maryland Book Bank
Contatta il venditoreVenditore con 5 stelleCondizione: Usato - Buono
EUR 3,10
EUR 4,05 spedizioneSpedito in U.S.A.Quantità: 1 disponibili
paperback. Condizione: Good. Corners are slightly bent. Used - Good.
Lingua: Inglese
Editore: -, 2019
- Brossura
Da: AwesomeBooks, Wallingford, Regno UnitoAwesomeBooks
Contatta il venditoreVenditore con 5 stelleCondizione: Usato - Molto buono
EUR 4,08
EUR 4,82 spedizioneSpedito da Regno Unito a U.S.A.Quantità: 2 disponibili
Paperback. Condizione: Very Good. Images of The National Archives: Codebreakers (Images of the The National Archives) This book is in very good condition and will be shipped within 24 hours of ordering. The cover may have some limited signs of wear but the pages are clean, intact and the spine remains undamaged. This book has cl…early been well maintained and looked after thus far. Money back guarantee if you are not satisfied. See all our books here, order more than 1 book and get discounted shipping.
Lingua: Inglese
Editore: Pen and Sword History, 2020
- Brossura
Da: HPB-Diamond, Dallas, TX, U.S.A.HPB-Diamond
Contatta il venditoreVenditore con 5 stelleCondizione: Usato - Molto buono
EUR 7,80
EUR 3,24 spedizioneSpedito in U.S.A.Quantità: 1 disponibili
paperback. Condizione: Very Good. Connecting readers with great books since 1972! Used books may not include companion materials, and may have some shelf wear or limited writing. We ship orders daily and Customer Service is our top priority.
Lingua: Inglese
Editore: Pen and Sword History, 2019
- Brossura
Da: WorldofBooks, Goring-By-Sea, WS, Regno UnitoWorldofBooks
Contatta il venditoreVenditore con 5 stelleCondizione: Usato - Molto buono
EUR 4,68
EUR 6,55 spedizioneSpedito da Regno Unito a U.S.A.Quantità: 2 disponibili
Paperback. Condizione: Very Good. The book has been read, but is in excellent condition. Pages are intact and not marred by notes or highlighting. The spine remains undamaged.
Altre immaginiLingua: Inglese
Editore: ?Pen and Sword History, UK, 2020
- Brossura
Da: The Anthropologists Closet, West Des Moines, IA, U.S.A.The Anthropologists Closet
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 10,63
EUR 4,75 spedizioneSpedito in U.S.A.Quantità: 1 disponibili
Paperback. Condizione: New. Details the history of British intelligence and code breaking. New large trade softcover in printed wraps. 8vo. (7 x 0.5 x 9.25 inches). Clean text free of marks or underlining. B&W photos and illustrations throughout the text. Includes an index and future readings. 144 pp. Fast shipping in a secure b…ook box mailer with tracking. The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars, the role of the Royal Mail's Secret Office and the activities the Admiralty's 'Room 40' leading to the creation of the Government's Code and Cypher School. The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars, the role of the Royal Mail's Secret Office and the activities the Admiralty's 'Room 40' leading to the creation of the Government's Code and Cypher School. The main theme of the book are the events of the Second World War and the battle to break the German enigma codes. The center of Britain's codebreaking operation was located at Bletchley Park in rural Buckinghamshire and it was from here that a hastily assembled army of codebreakers battled to decipher Nazi Germany's secret wartime communications. The deciphered high-level signals intelligence was known as Ultra and had a major influence on the outcome of the war, most notably contributing to crucial successes in the battle for the Atlantic and the D-Day landings in June 1944. The book also reveals the work undertaken in the Far-East and the allied efforts to break the Japanese military cipher code named Purple. The book ends with a re-assessment of the work undertaken by the British code breaker and mathematician Alan Turing and a brief overview of the codebreaking operations undertaken by GCHQ during the formative period of the Cold War.
Lingua: Inglese
Editore: Pen & Sword History 03/04/2020, 2020
- Brossura
Da: Bahamut Media, Reading, Regno UnitoBahamut Media
Contatta il venditoreVenditore con 5 stelleCondizione: Usato - Molto buono
EUR 10,66
EUR 8,16 spedizioneSpedito da Regno Unito a U.S.A.Quantità: 2 disponibili
Condizione: Very Good. Shipped within 24 hours from our UK warehouse. Clean, undamaged book with no damage to pages and minimal wear to the cover. Spine still tight, in very good condition. Remember if you are not happy, you are covered by our 100% money back guarantee.
Lingua: Inglese
Editore: Pen & Sword Books Ltd, Barnsley, 2020
- Brossura
Da: Grand Eagle Retail, Bensenville, IL, U.S.A.Grand Eagle Retail
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 20,46
Spedizione gratuitaSpedito in U.S.A.Quantità: 1 disponibili
Paperback. Condizione: new. Paperback. The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars, the role of the Royal Mail's Secret Office and the activities the Admiralty's Room 40' leading to the creation of the Government's Cod…e and Cypher School. The main theme of the book are the events of the Second World War and the battle to break the German enigma codes. The centre of Britain's codebreaking operation was located at Bletchley Park in rural Buckinghamshire and it was from here that a hastily assembled army of codebreakers battled to decipher Nazi German's secret wartime communications. The deciphered high-level signals intelligence was known as Ultra and had a major influence on the outcome of the war, most notably contributing to crucial successes in the battle for the Atlantic and the D-Day landings in June 1944. The book also reveals the work undertaken in the Far-East and the allied efforts to break the Japanese military cipher code named Purple. The book ends with a re-assessment of the work undertaken by the British code breaker and mathematician Alan Turing and a brief overview of the codebreaking operations undertaken by GCHQ during the formative period of the Cold War. AUTHOR: Stephen is a senior historian at The National Archives. He obtained his PhD from the Centre of Science, Technology and Medicine at the University of Manchester and was a Post-Doctoral Research Fellow at the Department of International Politics, University of Wales, Aberystwyth. During his time at The National Archives, Stephen completed a four-year secondment at the Foreign and Commonwealth Office where he was responsible for editing three volumes of documents on British Policy Overseas, the official record of British foreign policy. Stephen is a fellow of the Royal Historical Society and a member of the Arts and Humanities Research Council's Peer Review College. He has published a number of books and articles on the Cold War and has made regular media appearances to discuss record releases at The National Archives. The breaking of the Zimmerman telegram and the entry of the United States into the First World War. The interception of Soviet communications in the 1920s and the police raid against the Russian Trade Delegation. Shipping may be from multiple locations in the US or from the UK, depending on stock availability.
Lingua: Inglese
Editore: Pen and Sword History, 2020
- Brossura
Da: Book Bunker USA, Havertown, PA, U.S.A.Book Bunker USA
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 17,00
EUR 3,45 spedizioneSpedito in U.S.A.Quantità: 5 disponibili
Paperback. Condizione: New. *Brand new* Ships from USA.
Lingua: Inglese
Editore: Pen & Sword History, 2020
- Brossura
Da: Naval and Military Press Ltd, Uckfield, Regno UnitoNaval and Military Press Ltd
Contatta il venditoreVenditore con 4 stelleCondizione: Nuovo
EUR 6,01
EUR 16,95 spedizioneSpedito da Regno Unito a U.S.A.Quantità: 10 disponibili
Condizione: New. Softback, 144 pagesPublished Price £14.99 The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars, the role of the Royal Mail's Secret Office and the activities the Admiralty's Room 40' leading to the creation of… the Government's Code and Cypher School. The main theme of the book are the events of the Second World War and the battle to break the German enigma codes. The centre of Britain's codebreaking operation was located at Bletchley Park in rural Buckinghamshire and it was from here that a hastily assembled army of codebreakers battled to decipher Nazi German's secret wartime communications. The deciphered high-level signals intelligence was known as Ultra and had a major influence on the outcome of the war, most notably contributing to crucial successes in the battle for the Atlantic and the D-Day landings in June 1944\. The book also reveals the work undertaken in the Far-East and the allied efforts to break the Japanese military cipher code named Purple. The book ends with a re-assessment of the work undertaken by the British code breaker and mathematician Alan Turing and a brief overview of the codebreaking operations undertaken by GCHQ during the formative period of the Cold War.
Lingua: Inglese
Editore: Pen and Sword Books Ltd, GB, 2020
- Brossura
Da: Rarewaves USA, OSWEGO, IL, U.S.A.Rarewaves USA
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 24,63
Spedizione gratuitaSpedito in U.S.A.Quantità: 3 disponibili
Paperback. Condizione: New. The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars, the role of the Royal Mail's Secret Office and the activities the Admiralty's Room 40' leading to the creation of the Government's Code and Cyphe…r School. The main theme of the book are the events of the Second World War and the battle to break the German enigma codes. The centre of Britain's codebreaking operation was located at Bletchley Park in rural Buckinghamshire and it was from here that a hastily assembled army of codebreakers battled to decipher Nazi German's secret wartime communications. The deciphered high-level signals intelligence was known as Ultra and had a major influence on the outcome of the war, most notably contributing to crucial successes in the battle for the Atlantic and the D-Day landings in June 1944\. The book also reveals the work undertaken in the Far-East and the allied efforts to break the Japanese military cipher code named Purple. The book ends with a re-assessment of the work undertaken by the British code breaker and mathematician Alan Turing and a brief overview of the codebreaking operations undertaken by GCHQ during the formative period of the Cold War.
Lingua: Inglese
Editore: Pen and Sword Books Ltd, GB, 2020
- Brossura
Da: Rarewaves.com USA, London, LONDO, Regno UnitoRarewaves.com USA
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 30,73
Spedizione gratuitaSpedito da Regno Unito a U.S.A.Quantità: 3 disponibili
Paperback. Condizione: New. The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars, the role of the Royal Mail's Secret Office and the activities the Admiralty's Room 40' leading to the creation of the Government's Code and Cyphe…r School. The main theme of the book are the events of the Second World War and the battle to break the German enigma codes. The centre of Britain's codebreaking operation was located at Bletchley Park in rural Buckinghamshire and it was from here that a hastily assembled army of codebreakers battled to decipher Nazi German's secret wartime communications. The deciphered high-level signals intelligence was known as Ultra and had a major influence on the outcome of the war, most notably contributing to crucial successes in the battle for the Atlantic and the D-Day landings in June 1944\. The book also reveals the work undertaken in the Far-East and the allied efforts to break the Japanese military cipher code named Purple. The book ends with a re-assessment of the work undertaken by the British code breaker and mathematician Alan Turing and a brief overview of the codebreaking operations undertaken by GCHQ during the formative period of the Cold War.
Lingua: Inglese
Editore: Pen and Sword History, 2019
- Brossura
Da: Hay-on-Wye Booksellers, Hay-on-Wye, HEREF, Regno UnitoHay-on-Wye Booksellers
Contatta il venditoreVenditore con 4 stelleCondizione: Usato - Molto buono
EUR 6,63
EUR 29,23 spedizioneSpedito da Regno Unito a U.S.A.Quantità: 1 disponibili
Condizione: Very Good. New/unused condition with small scuffs and a small tear along the spine. The content is in new condition.
Lingua: Inglese
Editore: Pen & Sword Books Ltd, 2020
- Brossura
Da: Kennys Bookshop and Art Galleries Ltd., Galway, GY, IrlandaKennys Bookshop and Art Galleries Ltd.
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 28,32
EUR 9,50 spedizioneSpedito da Irlanda a U.S.A.Quantità: 2 disponibili
Condizione: New. 2020. Paperback. . . . . .
Lingua: Inglese
Editore: Pen and Sword History, 2019
- Brossura
Da: Bibliophile, London, Regno UnitoBibliophile
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 3,61
EUR 35,08 spedizioneSpedito da Regno Unito a U.S.A.Quantità: 9 disponibili
Condizione: New. Paperback.
Lingua: Inglese
Editore: Pen & Sword Books Ltd, 2020
- Brossura
Da: Book Grocer, Tullamarine, VIC, AustraliaBook Grocer
Contatta il venditoreVenditore con 5 stelleCondizione: Usato
EUR 14,18
EUR 25,92 spedizioneSpedito da Australia a U.S.A.Quantità: 1 disponibili
Paperback. Stephen Twigge, Pen & Sword Books Ltd. Author: Stephen TwiggeFormat: Paperback, 189mm x 234mm, 136 pagesPublished: Pen & Sword Books Ltd, United Kingdom, 2020The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars,…the role of the Royal Mail's Secret Office and the activities the Admiralty's Room 40' leading to the creation of the Government's Code and Cypher School. The main theme of the book are the events of the Second World War and the battle to break the German enigma codes. The centre of Britain's codebreaking operation was located at Bletchley Park in rural Buckinghamshire and it was from here that a hastily assembled army of codebreakers battled to decipher Nazi German's secret wartime communications. The deciphered high-level signals intelligence was known as Ultra and had a major influence on the outcome of the war, most notably contributing to crucial successes in the battle for the Atlantic and the D-Day landings in June 1944. The book also reveals the work undertaken in the Far-East and the allied efforts to break the Japanese military cipher code named Purple. The book ends with a re-assessment of the work undertaken by the British code breaker and mathematician Alan Turing and a brief overview of the codebreaking operations undertaken by GCHQ during the formative period of the Cold War. AUTHOR: Stephen is a senior historian at The National Archives. He obtained his PhD from the Centre of Science, Technology and Medicine at the University of Manchester and was a Post-Doctoral Research Fellow at the Department of International Politics, University of Wales, Aberystwyth. During his time at The National Archives, Stephen completed a four-year secondment at the Foreign and Commonwealth Office where he was responsible for editing three volumes of documents on British Policy Overseas, the official record of British foreign policy. Stephen is a fellow of the Royal Historical Society and a member of the Arts and Humanities Research Council's Peer Review College. He has published a number of books and articles on the Cold War and has made regular media appearances to discuss record releases at The National Archives.Stephen is a senior historian at The National Archives. He obtained his PhD from the Centre of Science, Technology and Medicine at the University of Manchester and was a Post-Doctoral Research Fellow at the Department of International Politics, University of Wales, Aberystwyth. During his time at The National Archives, Stephen completed a four-year secondment at the Foreign and Commonwealth Office where he was responsible for editing three volumes of documents on British Policy Overseas, the official record of British foreign policy. Stephen is a fellow of the Royal Historical Society and a member of the Arts and Humanities Research Council's Peer Review College. He has published a number of books and articles on the Cold War and has made regular media appearances to discuss record releases at The National Archives. Paperback.
Lingua: Inglese
Editore: Pen & Sword Books Ltd, 2019
- Brossura
Da: Kennys Bookstore, Olney, MD, U.S.A.Kennys Bookstore
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 33,67
EUR 9,07 spedizioneSpedito in U.S.A.Quantità: 2 disponibili
Condizione: New. 2020. Paperback. . . . . . Books ship from the US and Ireland.
Lingua: Inglese
Editore: Pen & Sword, 2020
- Brossura
Da: Revaluation Books, Exeter, Regno UnitoRevaluation Books
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 33,31
EUR 11,69 spedizioneSpedito da Regno Unito a U.S.A.Quantità: 2 disponibili
Paperback. Condizione: Brand New. 132 pages. 9.25x7.00x0.50 inches. In Stock.
Lingua: Inglese
Editore: Pen & Sword Books Ltd, Barnsley, 2020
- Brossura
Da: AussieBookSeller, Truganina, VIC, AustraliaAussieBookSeller
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 27,98
EUR 31,96 spedizioneSpedito da Australia a U.S.A.Quantità: 1 disponibili
Paperback. Condizione: new. Paperback. The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars, the role of the Royal Mail's Secret Office and the activities the Admiralty's Room 40' leading to the creation of the Government's Cod…e and Cypher School. The main theme of the book are the events of the Second World War and the battle to break the German enigma codes. The centre of Britain's codebreaking operation was located at Bletchley Park in rural Buckinghamshire and it was from here that a hastily assembled army of codebreakers battled to decipher Nazi German's secret wartime communications. The deciphered high-level signals intelligence was known as Ultra and had a major influence on the outcome of the war, most notably contributing to crucial successes in the battle for the Atlantic and the D-Day landings in June 1944. The book also reveals the work undertaken in the Far-East and the allied efforts to break the Japanese military cipher code named Purple. The book ends with a re-assessment of the work undertaken by the British code breaker and mathematician Alan Turing and a brief overview of the codebreaking operations undertaken by GCHQ during the formative period of the Cold War. AUTHOR: Stephen is a senior historian at The National Archives. He obtained his PhD from the Centre of Science, Technology and Medicine at the University of Manchester and was a Post-Doctoral Research Fellow at the Department of International Politics, University of Wales, Aberystwyth. During his time at The National Archives, Stephen completed a four-year secondment at the Foreign and Commonwealth Office where he was responsible for editing three volumes of documents on British Policy Overseas, the official record of British foreign policy. Stephen is a fellow of the Royal Historical Society and a member of the Arts and Humanities Research Council's Peer Review College. He has published a number of books and articles on the Cold War and has made regular media appearances to discuss record releases at The National Archives. The breaking of the Zimmerman telegram and the entry of the United States into the First World War. The interception of Soviet communications in the 1920s and the police raid against the Russian Trade Delegation. Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability.
Lingua: Inglese
Editore: Pen & Sword Books Ltd, Barnsley, 2020
- Brossura
Da: CitiRetail, Stevenage, Regno UnitoCitiRetail
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 24,08
EUR 43,26 spedizioneSpedito da Regno Unito a U.S.A.Quantità: 1 disponibili
Paperback. Condizione: new. Paperback. The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars, the role of the Royal Mail's Secret Office and the activities the Admiralty's Room 40' leading to the creation of the Government's Cod…e and Cypher School. The main theme of the book are the events of the Second World War and the battle to break the German enigma codes. The centre of Britain's codebreaking operation was located at Bletchley Park in rural Buckinghamshire and it was from here that a hastily assembled army of codebreakers battled to decipher Nazi German's secret wartime communications. The deciphered high-level signals intelligence was known as Ultra and had a major influence on the outcome of the war, most notably contributing to crucial successes in the battle for the Atlantic and the D-Day landings in June 1944. The book also reveals the work undertaken in the Far-East and the allied efforts to break the Japanese military cipher code named Purple. The book ends with a re-assessment of the work undertaken by the British code breaker and mathematician Alan Turing and a brief overview of the codebreaking operations undertaken by GCHQ during the formative period of the Cold War. AUTHOR: Stephen is a senior historian at The National Archives. He obtained his PhD from the Centre of Science, Technology and Medicine at the University of Manchester and was a Post-Doctoral Research Fellow at the Department of International Politics, University of Wales, Aberystwyth. During his time at The National Archives, Stephen completed a four-year secondment at the Foreign and Commonwealth Office where he was responsible for editing three volumes of documents on British Policy Overseas, the official record of British foreign policy. Stephen is a fellow of the Royal Historical Society and a member of the Arts and Humanities Research Council's Peer Review College. He has published a number of books and articles on the Cold War and has made regular media appearances to discuss record releases at The National Archives. The breaking of the Zimmerman telegram and the entry of the United States into the First World War. The interception of Soviet communications in the 1920s and the police raid against the Russian Trade Delegation. Shipping may be from our UK warehouse or from our Australian or US warehouses, depending on stock availability.
Lingua: Inglese
Editore: Pen and Sword Books Ltd, GB, 2020
- Brossura
Da: Rarewaves USA United, OSWEGO, IL, U.S.A.Rarewaves USA United
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 26,31
EUR 43,19 spedizioneSpedito in U.S.A.Quantità: 3 disponibili
Paperback. Condizione: New. The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars, the role of the Royal Mail's Secret Office and the activities the Admiralty's Room 40' leading to the creation of the Government's Code and Cyphe…r School. The main theme of the book are the events of the Second World War and the battle to break the German enigma codes. The centre of Britain's codebreaking operation was located at Bletchley Park in rural Buckinghamshire and it was from here that a hastily assembled army of codebreakers battled to decipher Nazi German's secret wartime communications. The deciphered high-level signals intelligence was known as Ultra and had a major influence on the outcome of the war, most notably contributing to crucial successes in the battle for the Atlantic and the D-Day landings in June 1944\. The book also reveals the work undertaken in the Far-East and the allied efforts to break the Japanese military cipher code named Purple. The book ends with a re-assessment of the work undertaken by the British code breaker and mathematician Alan Turing and a brief overview of the codebreaking operations undertaken by GCHQ during the formative period of the Cold War.
Lingua: Inglese
Editore: Pen & Sword Books Ltd, 2020
- Brossura
Da: moluna, Greven, Germaniamoluna
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 30,89
EUR 48,99 spedizioneSpedito da Germania a U.S.A.Quantità: 5 disponibili
Condizione: New. The breaking of the Zimmerman telegram and the entry of the United States into the First World War. The interception of Soviet communications in the 1920s and the police raid against the Russian Trade Delegation.KlappentextrnrnThe breaking o.
Lingua: Inglese
Editore: Pen and Sword Books Ltd, GB, 2020
- Brossura
Da: Rarewaves.com UK, London, Regno UnitoRarewaves.com UK
Contatta il venditoreVenditore con 5 stelleCondizione: Nuovo
EUR 28,54
EUR 76,00 spedizioneSpedito da Regno Unito a U.S.A.Quantità: 3 disponibili
Paperback. Condizione: New. The book reveals the story of British Codebreakers from the reign of Elizabeth I to the Cold War. It explores the use of ciphers during the Napoleonic wars, the role of the Royal Mail's Secret Office and the activities the Admiralty's Room 40' leading to the creation of the Government's Code and Cyphe…r School. The main theme of the book are the events of the Second World War and the battle to break the German enigma codes. The centre of Britain's codebreaking operation was located at Bletchley Park in rural Buckinghamshire and it was from here that a hastily assembled army of codebreakers battled to decipher Nazi German's secret wartime communications. The deciphered high-level signals intelligence was known as Ultra and had a major influence on the outcome of the war, most notably contributing to crucial successes in the battle for the Atlantic and the D-Day landings in June 1944\. The book also reveals the work undertaken in the Far-East and the allied efforts to break the Japanese military cipher code named Purple. The book ends with a re-assessment of the work undertaken by the British code breaker and mathematician Alan Turing and a brief overview of the codebreaking operations undertaken by GCHQ during the formative period of the Cold War.
