Post-War Consolidation and the Interwar Period Following the Armistice in 1918, many questioned the need for a large peacetime intelligence apparatus. The Genesis: Mansfield Smith-Cumming and the Secret Service The formal beginning of what would become MI6 is attributed to the creation of the Secret Service Bureau in 1909.
MI6 Early History: From 1916 Secret Service
The lessons learned in these muddy fields would define the service for decades. This involved building a network of agents behind German lines, intercepting communications, and supporting sabotage operations.
The Official Formation During the Great War While the roots trace to 1909, the question of "when did MI6 start" is most accurately answered with 1916. This era was crucial for transforming the ad-hoc organization of 1916 into a professional, albeit still relatively small, intelligence agency.
MI6 Early History: The Formative Years from 1916 and the Secret Service Genesis
The Modern Legacy and Public Revelation. The Precursor: MI1 and the Birth of a Necessity Before asking when MI6 started, one must acknowledge its predecessor organization, Military Intelligence, Section 1 (MI1).
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