Immerhof protected blockhouses that were constructed during a war that lasted how long?
Ouvrage Immerhof Ouvrage Immerhof, also known as Ouvrage Ferme-Immerhof, is one of the largest "petit ouvrages" of the Maginot Line of northeast France. Located near the community of Hettange-Grande, it is 7 km north of Thionville between the "gros ouvrages" of Molvange and Soetrich, the closest "ouvrage" to the Luxembourg frontier. It was part of the Fortified Sector of Thionville, in the Fortified Region of Metz, the strongest portion of the Line. Apart from its function as a communication post between the neighbouring "gros ouvrages", Immerhof also controlled the road and railway routes from Luxembourg, which pass in the immediate vicinity. In addition, Immerhof protected other Maginot works in the vicinity: the casemates of Kanfen, the infantry shelter of Stressling, the observation point and shelter of Hettange-Grande, and a number of nearby blockhouses constructed during the Phoney War.
Bunker A bunker is a defensive military fortification designed to protect people or valued materials from falling bombs or other attacks. Bunkers are mostly underground, compared to blockhouses which are mostly above ground. They were used extensively in World War I, World War II, and the Cold War for weapons facilities, command and control centers, and storage facilities (for example, in the event of nuclear war). Bunkers can also be used as protection from tornadoes.