Dragon’s teeth were used by several armies in the European theatre. The Germans made extensive use of them on the Siegfried Line and the Atlantic Wall. Typically, each tooth was 90 to 120 cm (3 to 4 ft) tall.
Land mines were often laid between teeth, and further obstacles were constructed along the lines of teeth, such as barbed wire to impede infantry or diagonally-placed steel beams to further hinder tanks. Many were laid in the United Kingdom in 1940/41, as part of the effort to strengthen the country’s defences against a possible German invasion.