 He left Trondheim for Stockholm later that month, and received training in psychological warfare.When Sørli came to Stockholm in January 1944 he took over for Gjems-Onstad, while Gjems-Onstad was to take over the leadership of Lark as well as to reorganise Milorg.Gjems-Onstad also founded the propaganda organisation Durham when he came back to Trondheim in March 1944.