Dragons' Teeth," Tank-traps in the Khyber Pass

Dragons' Teeth," Tank-traps in the Khyber Pass c.1947. They were made during WW2 when it seemed more than possible that Hitler's legions might overwhelm Southeastern Europe, Asia Minor and drive by land toward the British India. Tank traps were made along roads and river beds around Thal in 1942 "In the Kurram the contract was awarded to a Sikh, who thickly carpeted with 'dragons' teeth' and other concrete obstructions all the valleys down which the Panzers [German tanks] could roar. General Wavell, then C-in-C India, came to inspect these." - The Frontier Scouts by Charles Pocklington Chenevix Trench (1985)