In the 1947 MRES (Missing Research and Enquiry Service) report on the loss of the Robertson crew, the German witnesses give a slightly different account from the ones gathered many years later, see: The Loss of the Robertson Crew

MRES Report from the J10302 Oliver Brock Robertson service record in the Canadian National Archives, reference: FILE/DOSSIER : J10302 Oliver Brock Robertson, REFERENCE NUMBER / NUMÉRO DE RÉFÉRENCE: Service Number J10302 D.F.C.Reference number R112, Volume 30719 Item number 39587.