The Gallery units available from 1/30 t0 4/40 were bunkers with tunnels built into rockfaces and cliffs overlooking important mountainroutes in Troendelag (Trondheim area) and some important bridges in eastern Norway (like Fossum bridge).*
The concrete trench unit available from 1/30 to 4/40 were trenches with concrete roofs as additional protection for the defenders, these were used as defense of places such as the inland fortification Hoeytorp Fort*
*