During the summer of 1675, 1800 men were kept at work on the fortresses at Akershus, Fredrikstad, and Fredrikshald.
fortification | Dragon's teeth (fortification) | Coastal defence and fortification | Saint Agatha's breasts sculpted in the fortification walls, Mons, Var | Medieval fortification | Fortification of Dorchester Heights | Fortification | Food fortification | Cavalier (fortification) |