[In primitive society] All tribes did not take to settled life at one and the same time. Some becamesettled and some remained nomadic. The second thing to remember is that the tribes were never at peace withone another. They were always at war. When all tribes were in a Nomadic state the chief causes forintra-tribal warfare were (1) stealing cattle, (2) stealing women, and (3) stealthily grazing of cattle in thepastures belonging to other tribes.