Amoudruz entered the law school in Clermont-Ferrand. However, on 25 November 1943, the Gestapo raided the school and Amoudruz was taken as a hostage after having just turned 17. In December 1943, he was held captive at the Royallieu-Compiègne internment camp. He left the camp on 17 January 1944, being deported to the Buchenwald concentration camp. He was eventually locked up at the Flossenbürg concentration camp on 23 February 1944.