Counter-attacks
Several Norwegian military units that had mobilized as a precautionary measure in Northern Norway during the Winter War, in cooperation with Polish, French and British forces, launched several counterattacks with moderate success. Allied forces had several successes in Northern Norway, but were redirected for the futile defense of France. While Northern Norway ultimately fell, efforts there allowed the Norwegian government, including the Norwegian royal family, to escape and maintain the legitimate government in exile, as part of the Allies.
While stationed in London, the government contributed Norwegian forces to the Allied effort and ordered the Norwegian Merchant Fleet to assist in transportation. To facilitate this the ships were operated under the Nortraship organization, at that time the world's largest shipping company. It also created apprehension in the Nazi leadership that Allied forces might try to recapture Norway to deny German naval units access to the North Atlantic, tying up several hundred thousand troops that otherwise would have been deployed to other fronts.
Read more about this topic: Norwegian Resistance Movement