Rubuta ci gaba don wannan sakin layi - A matsayin marubuci, Eggen ya fara zama tare da wani game da rayuwa da mutuwar Janar Carl Gustav Fleischer, kwamandan kwamandan Norwegian a Narvik 1940
Ka yi haƙuri. Ya kuma rubuta hoton marubucin Agnar Mykle, surukinsa kuma ya rubuta litattafai tare da batutuwa daga tsakiyar zamanin Norway. A cikin 1993 Eggen ya wallafa "Yaron daga Gimle" - labarin tarihin rayuwar ɗan yarinyar Norway a cikin yanayin Nazi. Sakamakon haka, bayan shekara biyu yaran yakin Norway sun sami uzuri na hukuma.