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Archaic form of caltrop.

Roman caltrop at the Westphalian Museum of Archeology (German: Westfälisches Museum für Archäologie), Herne, North Rhine-Westphalia, Germany

Archaic form of caltrop.

A 16th-century caltrop

Archaic form of caltrop.

Crow's feet boards studded with spikes. These were laid on the ground to prevent the enemy from approaching the defences. This board was used by the Russian Army during the Battle of Balaclava. On display at Royal Engineers Museum, Kent.