XVII. His adventure with the people called Charicatani[150] was not less admired than any of his military exploits. The Charicatani are a people who live beyond the river Tagonius: they do not dwell in cities or villages; but there is a large lofty hill, which contains caves and hollows in the rocks, looking to the north. The whole of the country at the foot of the hill consists of a clayey mud and of light earth, easily broken in pieces, which is not strong enough to bear a man's tread; and if it is only slightly touched will spread all about, like unslaked lime or ashes. Whenever the barbarians through fear of war hid themselves in their caves, and, collecting all their plunder there kept quiet, they could not be taken by any force; and now, seeing that Sertorius had retired before Metellus, and had encamped near the hill, they despised him as being beaten, on which Sertorius, whether in passion or not wishing to appear to be flying from the enemy, at daybreak rode up to the place and examined it. But he found the mountain unassailable on all sides; and while he was perplexing himself to no purpose and uttering idle threats, he saw a great quantity of dust from this light earth carried by the wind against the barbarians; for the caves are turned, as I have said, to the north, and the wind which blows from that quarter (some call it "caecias") prevails most, and is the strongest of all the winds in those parts, being generated in wet plains and snow-covered mountains; and at that time particularly, it being the height of summer, it was strong, and maintained by the melting of the ice in the sub-arctic regions, and it blew most pleasantly both on the barbarians and their flocks, and refreshed them. Now, Sertorius, thinking on all these things, and also getting information from the country people, ordered his soldiers to take up some of the light ashy earth, and bringing it right opposite to the hill to make a heap of it there; which the barbarians thought to be intended as a mound for the purpose of getting at them, and they mocked him. Sertorius kept his soldiers thus employed till nightfall, when he led them away. At daybreak a gentle breeze at first began to blow, which stirred up the lightest part of the earth that had been heaped together, and scattered it about like chaff; but when the caecias began to blow strong, as the sun got higher, and the hills were all covered with dust, the soldiers got on the heap of earth and stirred it up to the bottom, and broke the clods; and some also rode their horses up and down through the earth, kicking up the light particles and raising them so as to be caught by the wind, which receiving all the earth that was broken and stirred up, drove it against the dwellings of the barbarians, whose doors were open to the caecias. The barbarians, having only the single opening to breathe through, upon which the wind fell, had their vision quickly obscured, and they were speedily overpowered by a suffocating difficulty of breathing, by reason of respiring a thick atmosphere filled with dust. Accordingly, after holding out with difficulty for two days, they surrendered on the third, and thus added not so much to the power as to the reputation of Sertorius, who had taken by stratagem a place that was impregnable to arms.