[3] Captured radio operators in France were forced to send false messages to British intelligence.
[4] That allowed Nazi intelligence to intercept Allied military information, convey disinformation to the enemy and actively fight resistance movements.
By doing so, Nazi intelligence made the pretense of being the French resistance with a script written for the enemy by the Gestapo or the Abwehr.
A similar Funkspiel technique, called Operation Scherhorn, was executed by the Soviet NKVD against Nazi secret services from August 1944 to May 1945.
Funkspiel also referred to a technique used by U-boat radio operators in which the frequency of transmission was changed consecutively[clarification needed] to confuse Allied intelligence with the objective of picking up enemy transmissions on the original channel.