A people as highly cultured as those of the Bronze Age must have had some system of government, and one that was a sensible advance over the government of the Neolithic people. In the Neolithic Age it was, doubtless, tribe against tribe. Confederacies, the union of several tribes for common purpose of defense, must have been more common at this age.18 The first Aryan tribes to arrive in Europe, as we have seen, were the Celts. In time, they had to withstand the pressure of invasion themselves. The Belgae, and other Germanic tribes, were also on the move. But war at this period would partake more of the nature of people against people, than of tribe against tribe. The civil and the military departments of government must have taken more definite shape, and we are not without evidence of fairly organized and disciplined forces. As early as two thousand eight hundred years before Christ, the sea-coast people of Europe, while yet in the Bronze Age, allied their forces for the conquest of Egypt.19 We have referred to the influence of trade in shaping civilization. It is commerce that to-day is carrying civilization to remote corners of the globe. Long before the dawn of history, it was an active agent in advancing culture. It is important to note the great expanse of commerce, both inland and marine, which prevailed during the Bronze Age. An important article of trade was, of course, bronze. The people who first learned the secret of its manufacture would speedily find a demand for their wares from surrounding tribes, and we have already pointed out how this trade would quickly give rise to local manufactures. But, to produce bronze, we know tin is just as necessary as copper—and all the countries of Europe are not provided with these metals; so more or less trade would inevitably take place. In various ways the stores of the bronze merchant might be lost, and only revealed in after years by accident. One of these deposits, found in France, is evidently the store of a merchant or trader from Etruria to the tribes of the north and west, and so gives us a quite vivid idea of the trade of that early time. It consisted of over four hundred articles of bronze, “comprising knives, sickles, lance-heads, horse-bits, rings, buttons, pendants, and bracelets.”20