"Bronze." Ashe weighed a dagger in his hand one day. Its hilt, made of dark horn studded with an intricate pattern of tiny golden nail heads, had a gleam not unlike that of the blade. "Do you know, Murdock, that bronze can be tougher than steel? If it wasn't that iron is so much more plentiful and easier to work, we might never have come out of the Bronze Age? Iron is cheaper and easier found, and when the first smith learned to work it, an end came to one way of life, a beginning to another. "Yes, bronze is important to us here, and so are the men who worked it. Smiths were sacred in the old days. We know that they made a secret of their trade which overrode the bounds of district, tribe, and race. A smith was welcome in any village, his person safe on the road. In fact, the roads themselves were under the protection of the gods; there was peace on them for all wayfarers. The land was wide then, and it was empty. The tribes were few and small, and there was plenty of room for the hunter, the farmer, the trader. Life was not such a scramble of man against man, but rather of man against nature----" "No wars?" asked Ross. "Then why the bow-and-dagger drill?" "Wars were small affairs, disputes between family clans or tribes. As for the bow, there were formidable things in the forests--giant animals, wolves, wild boars----" "Cave bears?" Ashe sighed with weary patience. "Get it through your head, Murdock, that history is much longer than you seem to think. Cave bears and the use of bronze weapons do not overlap. No, you will have to go back maybe several thousand years earlier and then hunt your bear with a flint-tipped spear in your hand if you are fool enough to try it." "Or take a rifle with you." Ross made a suggestion he had longed to voice for some time. Ashe rounded on him swiftly, and Ross knew him well enough now to realize that he was seriously displeased. "That is just what you don't do, Murdock, not from this base, as you well know by now. You take no weapon from here which is not designed for the period in which your run lies. Just as you do not become embroiled while on that run in any action which might influence the course of history." Ross went on polishing the blade he held. "What would happen if someone did break that rule?" Ashe put down the dagger he had been playing with. "We don't know--we just don't know. So far we have operated in the fringe territory, keeping away from any district with a history which we can trace accurately. Maybe some day--" his eyes were on a wall of weapon racks he plainly did not see--"maybe some day we can stand and watch the rise of the pyramids, witness the march of Alexander's armies.... But not yet. We stay away from history, and we are sure that the Reds are doing the same. It has become the old problem once presented by the atom bomb. Nobody wants to upset the balance and take the consequences. Let us find their outpost and we'll withdraw our men from all the other runs at once."