These included memoirs from his work in the Norwegian resistance as well as thorough historical surveys of Norwegians who were arrested and detained by Nazi authorities during the war .
After he retired , Ottosen wrote a series of historical accounts from World War II .
These included memoirs from Ottosen 's work in the Norwegian resistance as well as thorough historical surveys of Norwegians who were arrested and detained by Nazi authorities during the war .
After he retired , Ottosen wrote a series of historical accounts from World War II .