Caltrop
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A caltrop is an area denial weapon made up of usually four, but possibly more, sharp nails or spines arranged in such a manner that one of them always points upward from a stable base. Historically, c
Roman caltrop at the Westphalian Museum of Archeology (German: Westfälisches Museum für Archäologie), Herne, North Rhine-Westphalia, Germany
Bronze caltrops from the Three Kingdoms era
A 16th-century caltrop
Traditional caltrops and mines from the Mongol Empire
Dragon's teeth are pyramidal anti-tank obstacles of reinforced concrete first used during the Second World War to impede the movement of tanks and mechanised infantry. The idea was to slow down and ch
Dragon's teeth near Aachen, Germany, part of the Siegfried Line
World War II dragon's teeth at Fairbourne Beach, Wales, in 2009, designed to stop tanks landing
Dragon's teeth on GHQ Line near Waverley Abbey, Surrey in 2006
United States Army troops passing through dragon's teeth on the Siegfried Line in 1944.