Operation Rentier (Reindeer) was a German operation during World War II intended to secure the nickel mines around Petsamo in Finland, against a Soviet attack in the event of a renewed war between Finland and the Soviet Union. The planning for the operation started on 13 August 1940, after the German occupation of Norway was complete, and was finalized in October that year. The plan called for the two divisions of the Alpine Corps Norwegen to occupy Petsamo and prevent Soviet capture of strategically important mines.