After interrogation, he was taken to Fresnes prison. Classified as a "Terrorflieger" (terror flier), he was not accorded prisoner-of-war (POW) status, but instead treated as a criminal and spy. By 15 August 1944, Lamason was senior officer of a group of 168 captured Allied airmen who were taken by train to Buchenwald concentration camp, arriving there five days later.