MI5 at War 1909-1918 [electronic resource] : How MI5 Foiled the Spies of the Kaiser in the First World War / Chris Northcott.

"The years 1909-1918 can be regarded as formative for MI5, an era in which it developed from a small counter-espionage bureau into an established security intelligence agency. MI5's main roles during this period were counter-espionage and advising the War Office on how to deal with the police and th...

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