Nazi plans for the Territory of the Military Commander in Serbia as a whole however intended for the country to remain under some form of permanent German control. This was believed necessary to ensure German dominion over the Danubian basin of South-Eastern Europe, an economically vital area in consideration of Germany's wartime goals for the eastern territories that it expected to conquer in the Soviet Union. German plans did call for re-making the strategically located city of Belgrade as a "fortress-city of the Reich" ("Reichsfestung Belgrad") to ensure control over the Iron Gate, populated only by Germans. The city's possible renaming to "Prinz-Eugen-Stadt" was also discussed.