"True enough. On the other hand, don't belittle the ingenuity of the smiths or the native intelligence of men in any era. These tribesmen might not be able to reproduce your gun, but it would set them thinking along new lines. We might find that they would think our time right out of being. No, we dare not play tricks with the past. This is the same situation we faced immediately after the discovery of the atom bomb. Everybody raced to produce that new weapon and then sat around and shivered for fear we'd be crazy enough to use it on each other. "The Reds have made new discoveries which we have to match, or we will go under. But back in time we have to be careful, both of us, or perhaps destroy the world we do live in." "What do we do now?" McNeil wanted to know. "Murdock and I came here only for a trial run. It's his test. The sub is to call for us about nine days from now." "So if we sit tight--if we _can_ sit tight--" McNeil lay down again--"they will take us out. Meanwhile we have nine days." They spent three more days in the cave. McNeil was on his feet and impatient to leave before Ashe was able to hobble well enough to travel. Though Ross and McNeil took turns at hunting and guard duty, they saw no signs that the tribesmen were tracking them. Apparently Lal had done as he promised, withdrawing to the marsh and hiding there apart from his people. In the gray of pre-dawn on the fourth day Ashe wakened Ross. Their fire had been buried with earth, and already the cave seemed bleak. They ate venison roasted the night before and went out into the chill of a fog. A little way down the valley McNeil joined them out of the mist from his guard post. Keeping their pace to one which favored Ashe's healing wound, they made their way inland in the direction of the track linking the villages. Crossing that road they continued northward, the land beginning to rise under them. Far away they heard the blatting of sheep, the bark of a dog. In the fog, Ross stumbled in a shallow ditch beyond which lay a stubbled field. Ashe paused to look about him, his nostrils expanding as if he were a hound smelling out their trail. The three went on, crossing a whole series of small, irregular fields. Ross was sure that the yield from any of these cleared strips must be scanty. The fog was thickening. Ashe pressed the pace, using his handmade crutch carefully. He gave an audible sigh of relief when they were faced at last by two stone monoliths rising like pillars. A third stone lay across them, forming a rude arch through which they saw a narrow valley running back into the hills.