Operation Bittern (Norwegian: Bittern-ekspedisjonen, known as Bitern in the oldest sources) was a military operation in occupied Norway planned and carried out in 1942 by the British Special Operations Executive (SOE) and the Norwegian government-in-exile in London. Four SOE agents and instructors—Thor Helliessen, Jan Allan, Ruben Langmo and Johannes S. Andersen—were sent to Norway and parachuted into Nordmarka north of Oslo in October 1942.
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