That is the correct answer.
The caltrop was constructed of iron and had four short 'arms' ending in sharp points. The arms were bent so that no matter how the object was lying, one point was always aimed upward. When an unsuspecting infantryman or horse would step onto the caltrop, the sharp point aimed upward would puncture the bottom of the foot or hoof. The injury would not kill man or beast, but it would slow them down.
Collection of Larry D. Smith
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