Bunkers existed in different sizes and had various functions. The bunkers that the army had constructed along the Siegfried Line aimed to stop the Allied troops advancing to Germany.
A bunker was a formidable defense: they were always strategically placed, so they had a good view of the field of fire making it very difficult for the Allied infantry to directly attack. German soldiers in a bunker were relatively safe. Heavy artillery was needed to blow up a bunker. A few soldiers in a German bunker could make things very difficult for a larger number of Allied soldiers.
In a typical bunker there were several small rooms: a living space, an armory, an ammunition room and the room where the waepaons were kept, usually a machine gun and sometimes an anti-tank gun.
Many German bunkers were been blown up during the war and after the war the rest followed.
Construction Drawing of a German bunker
Source: Public domain/US Army/collection Arie-Jan van Hees
Construction Drawing of a German bunker
Source: Public domain/US Army/collection Arie-Jan van Hees
drawing of a German bunker
Source: Public domain/US Army/collection Arie-Jan van Hees
Interior of a German bunker
Source: Public domain/US Army/collection Arie-Jan van Hees
Entrance of a German bunker
Source: Public domain/US Army/collection Arie-Jan van Hees
Camouflaged bunkers
Source: Public domain/US Army/collection Arie-Jan van Hees
Destroyed German bunker
Source: Public domain/US Army/collection Arie-Jan van Hees