Rønneberg subsequently commanded other raids against the Germans, including the Fieldfare operation in Sunnmøre, in preparation for attacks against German supply lines in the Romsdal valley. In January 1945 Rønneberg had led a three-man unit of NOR.I.C.1 on a mission to destroy the Stuguflåt railway bridge, blowing up the bridge with a charge of plastic explosives, putting it out of service for three weeks. The team then escaped without casualties. His service with NOR.I.C.1 ended with the liberation of Norway in 1945.