In 1907 Major Vernon Kell become Director of the Home Section of the Secret Service Bureau with responsibility of investigating espionage, sabotage and subversion within and outside Britain. Later the organisation became known as MI5. In 1911 MI6 took over responsibility for counter-espionage outside Britain.

Working closely with Sir Basil Thomson and Special Branch, and MI6, MI5 managed to capture eleven German spies during the war. All the men were executed, as was Sir Roger Casement, who was found guilty of treason in 1916.

The First World War is available from Amazon

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