On His Majesty's Secret Service The Duke of Wellington famously said that the art of war was discovering what you don't know by what you do-guessing what was on the other side of the hill. The best way to know what was over that hill was to send someone to look for you. The duke was no stranger to scouts, spies and intelligence officers and knew their value. As important as the spying itself was the need to stop enemy agents employed in the same work. By the later 19th century the means by which intelligence work could be undertaken was as a result of developments in communication, transport and technology in all its forms becoming more sophisticated. Countermeasures likewise became more difficult and complex. The decision made by many governments was to formalise the operations of espionage and counterespionage agents into dedicated services. This book, by a member of the British Secret Service, offers an essential insight into intelligence activities during the Great War....

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