Caltrop - Caltrop-like Devices

Caltrop-like Devices

Punji sticks perform a similar role to caltrops. These are sharpened sticks placed vertically in the ground. Their use in modern times targets the body and limbs of a falling victim rather than well-shod feet, by means of a pit or tripwire.

During the Second World War, large caltrop shaped objects made from reinforced concrete were used as anti-tank devices, although it seems that these were rare. Very much more common were concrete devices called dragon's teeth that were designed to wedge into tank treads, and large ones weighing over 1 tonne (1.1 tons) are still used by the army to deny access to wheeled vehicles, especially in camp areas. However, dragon's teeth are immobile, so the analogy with the caltrop is inexact. Another caltrop-like World War II defence is the massive, steel, freestanding Czech hedgehogs that were designed as anti-tank obstacles and were also used to damage warships and landing craft. These were in heavy use at Normandy and other beach conflicts.

Caltrop-like concrete blocks that interlock when piled up are used in the construction of sea defences.