The Battle for Norway 1940-1942 by John Grehan download in ePub, pdf, iPad
He believed that the Norwegian ports would be of crucial importance for Germany in a war with the United Kingdom. Fears began to crop up in German high command that Norway and Sweden would then allow Allied troop movement to aid Finland. The French government pushed for action to be taken to confront the Germans away from France. The Norwegian government's concern for the country's supply lines played an important role in persuading them to accept the agreement.
The first such violations were the sinkings in Norwegian territorial waters of several British ships by German U-boats. When Altmark began the return journey to Germany she carried prisoners taken from the Allied ships sunk by Admiral Graf Spee. The boarding action led to the freeing of Allied prisoners of war held on the German ship.
This initially involved a plan to penetrate the Baltic with a naval force. As long as the Allies did not enter Norwegian waters, there would be safe passage for merchant vessels travelling along the Norwegian coast to ship the ore that Germany was importing. The boarding party killed seven Germans in the process.
In the following months aircraft from all the belligerents violated Norwegian neutrality. The proposed Allied deployments never occurred, after protests from both Norway and Sweden, when the issue of transfers of troops through their territory was suggested. While the British supported this operation, the French were against it, since they also depended on the Rhine and feared German reprisals on French soil. Quisling proposed a pan-German cooperation between Nazi-Germany and Norway. The discovery of the ship's location led the Royal Navy to send one light cruiser and five destroyers patrolling nearby to the area.