Caltrop, Wikininja

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. Caltrops serve to slow down the advance of horses and human troops. Shinobi wouldn't normally scatter these randomly on the run but instead they were placed in areas where they could provide a passive defense. In ancient Japan, common footwear co

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