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Re: Convoy reconnaissance
Luftwaffe long-range reconnaissance over the Atlantic with any meaningful coverage in October 1939 is doubtful. But the convoy's cargo, departure and movements were quite likely known to German Abwehr agents and to the naval Funkhorchdienst operating out of Hamburg. You can find basic coverage of this subject in the following books as well as those of more current vintage on the same topic:
Farago, Ladislas. The Game of the Foxes: The Untold Story of German Espionage in the United States and Great Britain During World War II.
Kahn, David. Hitler’s Spies: German Military Intelligence in World War II.
L.
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