The tribes that settled in the North grew in time to have many peculiarities of their own, and as their countries grew more and more populous, they needed more things that could not easily be had, and a fashion of plundering their neighbors began to prevail. Men were still more or less beasts of prey. Invaders must be kept out, and at last much of the industry of Scandinavia was connected with the carrying on of an almost universal fighting and marauding. Ships must be built, and there must be endless [Pg004] supplies of armor and weapons. Stones were easily collected for missiles or made fit for arrows and spear-heads, and metals were worked with great care. In Norway and Sweden were the best places to find all these, and if the Northmen planned to fight a great battle, they had to transport a huge quantity of stones, iron, and bronze. It is easy to see why one day's battle was almost always decisive in ancient times, for supplies could not be quickly forwarded from point to point, and after the arrows were all shot and the conquered were chased off the field, they had no further means of offence except a hand-to-hand fight with those who had won the right to pick up the fallen spears at their leisure. So, too, an unexpected invasion was likely to prove successful; it was a work of time to get ready for a battle, and when the Northmen swooped down upon some shore town of Britain or Gaul, the unlucky citizens were at their mercy. And while the Northmen had fish and game and were mighty hunters, and their rocks and mines helped forward their warlike enterprises, so the forests supplied them with ship timber, and they gained renown as sailors wherever their fame extended. There was a great difference, however, between the manner of life in Norway and that of England or France. The Norwegian stone, however useful for arrow-heads or axes, was not fit for building purposes. There is hardly any clay there, either, to make bricks with, so that wood has usually been the only material for houses. In the Southern countries there had always been rude castles in which [Pg006] the people could shelter themselves, but the Northmen could build no castles that a torch could not destroy. They trusted much more to their ships than to their houses, and some of their great captains disdained to live on shore at all. [Illustration: IRON CHISEL FOUND IN AAMOT PARISH, OESTERDALEN. IRON POINT OF A SPEAR WITH INLAID WORK OF SILVER, FOUND AT NESNE, IN NORDLAND.]