books.google.co.in - Once warfare became established in ancient civilizations, it's hard to find any other social institution that developed as quickly. In less than a thousand years, humans brought forth the sword, sling, dagger, mace, bronze and copper weapons, and fortified towns. The next thousand years saw the emergence...http://books.google.co.in/books/about/The_Ancient_World.html?id=HscIwvtkq2UC&utm_source=gb-gplus-shareThe Ancient World
