A caltrop also known as caltrap, galtrop, cheval trap, galthrap, galtrap, calthrop, crow's foot is an antipersonnel weapon made up of two or more sharp nails or spines arranged in such a manner that one of them always points upward from a stable base (for example, a tetrahedron). Caltrops were part of defenses that served to slow the advance of horses, and human troops. In more modern times, caltrops are used against wheeled vehicles with pneumatic tires.
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