With the group she helped the British Special Operations Executive parachute weapons and supplies into Denmark for distribution to the resistance.
[1] In March 1944, the Gestapo made an "incredible number of arrests" including in the region of Randers the "nationally known folklore collector and keeper of Hvidsten inn Marius Fiil", their son Niels, their 17-year-old daughter Gerda, their daughter Kirstine and her husband brewery worker Peter Sørensen.
[5] The following month De frie Danske reported on her husband again, that he along with other arrestees from Hvidsten had been transferred from Randers to Vestre Fængsel.
[2] On 15 July 1944, De frie Danske reported on the executions, the life sentence of her older daughter and the two-year sentence of her younger daughter and compared her husband to Svend Gønge and Niels Ebbesen while lamenting her profound loss: In the January 1945 issue of the resistance newspaper Frit Danmark (Free Denmark) reported that on 29 June 1944 the executions of the Hvidsten group members had taken place.
[citation needed] In the 2012 Danish drama film Hvidsten Gruppen (This Life), Gudrun Fiil is portrayed by Bodil Jørgensen.