A part of the Lapland War, Operation Nordlicht ("Northern Light") was a German operation during the end of World War II. After Finland had made peace with the USSR, the Germans planned to fall back to defense lines built and equipped in advance across Finnish Lapland (Operation Birke). During the operation, the Oberkommando der Wehrmacht gave an order to move from Operation Birke to Operation Nordlicht on 4 October 1944. This meant that instead of evacuating everything and then fortifying on the strong defensive positions German 20th Mountain Army was to retreat according to a set timetable to a new defense line in Lyngen, Norway. The Germans retreated using scorched earth tactics, and destroyed almost all buildings and all boats in Finnmark, thus denying the enemy any facilities in the area. These same tactics had already been used in Finnish Lapland. The retreat ended on January 30, 1945.