When the Continuation War between Finland and the Soviet Union started in 1941, the Finnish government allowed German troops from the German 20th Mountain Army in Norway to be stationed in Lapland to help defend the long border. The objective of the Germans was to control the nickel mines in Petsamo and to conquer the Russian port of Murmansk, cutting the Soviet Union off from Allied supply convoys. Rovaniemi was the German HQ in Lapland and also the base of Luftflotte 5 of the Luftwaffe.