Fortress Europe

Fortress Europe (German: Festung Europa) was a military propaganda term used by both sides of the Second World War which referred to the areas of Continental Europe occupied by Nazi Germany, as opposed to the United Kingdom across the Channel.

In British phraseology, Fortress Europe meant the battle honour accorded to Royal Air Force and Allied squadrons during the war, but to qualify, operations had to be made by aircraft based in Britain against targets in Germany, Italy and other parts of German-occupied Europe, in the period from the fall of France to the Normandy invasion.

Simultaneously, the term Festung Europa was being used by Nazi propaganda, namely to refer to Hitler's and the Wehrmacht's plans to fortify the whole of occupied Europe, in order to prevent invasion from the British Isle's troops. These measures included the construction of the Atlantic wall, along with reorganization of the Luftwaffe for air defense. This use of the term Fortress Europe was subsequently adopted by correspondents and historians in the English language to describe the military efforts of the Axis powers at defending the continent from the Allies.

Currently, within Europe, the term is used either to describe dumping effect of external borders in commercial matters, or as a pejorative description of the state of immigration into the European Union. This can be in reference either to attitudes toward immigration, or to the system of border patrols and detention centers that are used to help prevent illegal immigration into the European Union.

...
Wikipedia