Caltrops - a Device Built After Nature

[VANDOO]

I REMEMBER IN MANY OLD BOOKS ABOUT AFRICA THE SAFARI OFTEN BUILT A ENCLOSURE OF THORN BUSHES AROUND THE CAMP AT NIGHT TO KEEP OUT LIONS AND ENEMYS. THEY CALLED IT A BOMBA I SUSPECT IT WAS LIKELY NOT FICTION BUT COMMON PRACTICE WHERE SUCH THORN BUSHES OR TREES WERE AVAILABLE.