Atlantic Wall

After the German army in 1941 had conquered most of Western Europe, they opposite a huge problem. The conquest of England pulled out and an impending invasion of Russia called for the mobilization of large armies. While Germans had 5000 km. conquered coastline from North Cape to Spain to be defended against a possible Allied invasion. The solution was the construction of the Atlantic Wall, a series of more or less fortified strongholds along the coast. There were dug trenches and tank pits, built bunkers and  and built radar stations and airfields. Barbed wire was rolled out and sand dunes were mined. Everything to save soldiers who thus could be sent to the east.

The Germans had gained experience from the construction of Westwall in the 1930s and these were continued for Atlantic Wall. There was produced a large number of bunker types, called regelbau system, standardized design and thereby streamlined construction.