 He was (again) captured, this time by Nazi Germany's "Geheime Feldpolizei" (GFP or Secret Field Police) in October 1941, sent to a series of prisons and concentration camps and ultimately executed as a spy on March 13, 1944.From a young age on his family estate in Sterrebeek, Derscheid developed an interest in ornithology and aviculture.He built a research station for bird behavior called "Armendy Farm" that was active in the 1930s.