purpose of the caves was to provide flanking fire on the barbed wire
closures, so hostile infantry
was shot at from the side while they forced the barbed wire entanglements.
Completely in the spirit of experiences and the huge huge losses this tactic
had caused at the trenches on the
battlefields of Europe.
The double caves were equipped with 4 recoil guns and 2 floodlights. They
were angled, and had two flanking tasks.
The Caves were gradually replaced by so-called galleries, presumably because
the large hole for the floodlight was too great a risk for caves.
The caves consisted of 12-15 cm reinforced concrete in the walls and 20-25
cm in the ceiling.
Rocks were placed under 0.5-1 m
earth for early detonation.
29 pcs. single caves with 1
upper operational room with 2 recoil guns and a floodlight.
room beneath, with exit to at little trench.
single caves with an observation stand.
The Grusgrav South Cave
The Højgaard West
The Snoldelevvej Cave
fields of barbed wire are angled, double caves were built.
There were 7 double caves with one
operational upper room with 4 recoil guns and 2
The 7 double caves are situated in the
Karlslunde (5) and Tune(2)
caves in the Roskilde area was numbered F1 – F7
(i parantes) but later got local names.