Thomas Harris plotted to save a phantom spy network from Abwehr defectors
By Vera Kessler ·
Nazi high command believed a phantom army existed in Britain during D-Day, but the ingenious plans used to shield this lie from exposure stay hidden in the archives.
Juan Pujol García operated under a rotating set of identities: Garbo, Bovril, and Immortal. According to the public record, this Spanish spy functioned as a double agent for the United Kingdom, maintaining a fictitious network of agents—codenamed "Arabal" by the Germans—to feed the Nazi Abwehr a steady stream of misinformation throughout World War II.
While the history of Pujol García's success is well-documented in general histories, the administrative footprints left behind in the UK National Archives offer a narrower view of how the Security Service managed the man and the risks he carried. Specifically, the catalogue entry for file KV 2/4200 provides a window into the operational anxiety that followed the Allied invasion of Normandy.
Garbo, Bovril, Immortal
The file's catalogue entry records that Pujol García was a "celebrated wartime MI5 double cross agent." The primary value of his operation was the channel he maintained with the Abwehr, which the Security Service utilized for "the purposes of strategic deception." The catalogue notes that this work was particularly significant regarding D-Day, where the illusion of a fake agent network helped mislead the German high command about the actual site and timing of the landings.
According to the archival description, KV 2/4200 does not merely track the agent's successes but documents the "progressive development of the GARBO sub-agent 'network'" and the specific schemes designed to convey disinformation to the enemy. This reflects a calculated build-up: the creation of a phantom army of spies that existed only on paper, yet was believed by the Abwehr to be a vital source of intelligence on the ground in Britain.
The Abwehr Defectors
Success in espionage is often a matter of timing, and the catalogue entry for KV 2/4200 highlights a moment where that timing nearly failed. Following D-Day, the stability of the GARBO network was compromised. The archival record states that the security of the operation was "threatened by defections from Abwehr ranks."
When intelligence officers defect, they do not travel alone; they bring their rosters, their contacts, and the specific details of the agents they managed. For an operation built entirely on a fiction—like Pujol García's fictitious sub-agents—a single defector with the right ledger could collapse the entire house of cards. The risk was not just that Pujol García would be exposed, but that the Germans would realize they had been systematically lied to for years, potentially leading them to question other streams of British intelligence.
To mitigate this, the catalogue entry notes that a case officer named Thomas Harris drew up "various ingenious contingency plans" in readiness. The nature of these plans remains hidden behind the catalogue description; we know they existed and that Harris designed them to protect the network from the fallout of German defections, but the specific mechanics of the "ingenious" solutions are not detailed in the summary.
Letters and WT
The scope of the GARBO operation is further illustrated by the volume of related files in the KV series. While KV 2/4200 deals with the personal file and the strategic management of the agent, other records focus on the raw materials of the deception. Files KV 2/63, KV 2/64, KV 2/66, and KV 2/67 contain copies of communications sent by letter and wireless telegraphy (WT) to the Germans. These documents incorporated the specific British deception material that Pujol García was tasked with delivering.
This suggests a highly curated process where the "disinformation" mentioned in the KV 2/4200 catalogue entry was meticulously drafted by MI5 before being passed to Pujol García for transmission. It was a partnership of convenience: the British provided the script, and the Spaniard provided the channel.
The Security Service also maintained a broader interest in the mechanics of lying to the enemy. File KV 4/429, for example, describes policy and procedure regarding "channels for deception other than special agents." The catalogue description for that file notes a focus on the spreading of false information by means other than the "double-cross system of 'turned' double agents."
While other archives, including the NSArchive and the Internet Archive, maintain records on later intelligence disruptions or general World War II biographies, the UK National Archives' KV series focuses on the operational friction of the era. The record of Juan Pujol García is not just one of a successful spy, but of a precarious balance maintained by handlers like Thomas Harris. The catalogue entry for KV 2/4200 leaves the specific details of those contingency plans unstated, leaving only the knowledge that the Security Service was preparing for the moment the Abwehr finally learned the truth.