The tribes prospered, enriching themselves with the produce of the earth and with their cattle. Some, having discovered copper ore in the neighbourhood, manufactured arms and utensils. There were also potters who wrought skilfully in clay. At certain periods of the year, merchants brought to the valley stuffs, salt, spices, and even wine in leathern bottles. They took in exchange articles of bronze, skins, cheese, and corn. The tribes, not having had any fresh attacks to resist during a lengthened period, left off guarding the camp, which was rarely visited except on occasion of certain solemnities and of assemblies convoked by the Druids. The latter lived by themselves, surrounded by their college, within the vast inclosure which they cultivated, and where their sheep and cattle grazed. The ramparts, whose timber work had decayed, had sunk, and presented only a slight elevation. They were overgrown with vegetation in several places. But in the peaceful state in which the tribes were living, no one thought of repairing these defences. The inhabitants of the valley had been frequently embroiled with the neighbouring tribes, and had often come to blows with them; but peace was soon restored, for none of these groups of tribes cherished the intention of subjugating its neighbours and seizing their territory. Nevertheless repose was irksome to them, and their youths would often quit the valley in quest of adventures, and to see the world. About 389 B.C., a great number of men, attracted by the seductive eloquence of a Brenn--a chief elected by certain tribes to command distant expeditions--had quitted their hearths in the hope of amassing wealthy spoils in the southern lands beyond the mountains. Two years having passed away, a small number made their appearance again in the valley; they brought with them gold and costly fabrics, and marvellous were the tales they told of the countries they had traversed, and in which they had been incessantly fighting. They had seen cities environed by strong stone walls, and filled with magnificent public buildings and sumptuous mansions--richly fertile regions, where the vine and luscious fruits of every kind were cultivated.