Raiding followed a geographic pattern originating in the north. The southern tribes that lived closest to the trade cities of the Silk Route always had more goods than the more distant northern tribes. The southern men had the best weapons, and to succeed against them, the northern men had to move quicker, think more cleverly, and fight harder. This alternating pattern of trade and raiding supplied a slow, but steady, trickle of metal and textile goods moving northward, where the weather was always worse, the grazing more sparse, and men more rugged and violent.