then he saw an army of ten thousand raggle-taggle castoff men and women driving east , driving across the desert and into the mountains , a rough beast of an army whose time had come round at last ; they loaded down trucks and jeeps and wagoneers and campers and tanks ; each man and woman wore a dark stone about his or her neck , and deep in some of those stones was a red shape that might have been an eye or might have been a key .