The spy was a German.
The spy also identified the location of the Wolfsschanze, or Wolf’s Lair, Hitler’s fortified military headquarters on the Eastern Front. The lair was built in the woods of Eastern Prussia in the run-up to Operation Barbarossa, the Nazi invasion of the Soviet Union, and Hitler spent many months there between 1941 and November 1944. The British noted that Knopf’s “accurate information on... the position of Hitler’s HQ [is] confirmed from Most Secret Sources”. Hitler spent over 800 uninterupted days there. The myth that the allies didn't know its location goes on.
While gratefully accepting Polish Intelligence, Britain was secretly spying on the Polish Government in exile by intercepting and decoding its messages. These intercepted messages provided additional evidence of Knopf’s value and reliability as a spy. The Brits are so thorough.
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