A military weapon consisting of four iron spikes arranged so that one point always faces upward, used to injure the feet of soldiers or puncture tires.
From gall (meaning to injure) plus trap, literally an 'injury trap.' These caltrops (variant spelling) were used from medieval times through modern warfare.
Galtraps appear in ancient Roman military records and medieval illustrations—they're the original anti-personnel weapon and inspired modern versions called 'tire traps' used by police!
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