Human beings probably fought each other from the very beginning. They killed each other using weapons prevalent at that time. Cave paintings of Europe and Africa gave evidence of existence of primitive weapons like clubs, spears and axes as back as 10000 BC. Till the discovery of metals, weapons were made of wood and stone. Primitive weapons included swords, daggers, daggers, bow & arrow and slings. Initially leather and wooden shield were used but subsequently metallic shields and helmets came into existence. Other defensive war weapons included breastplates and backplates. Men mostly fought on foot till 6000 year ago. Chariots drawn by donkeys and horses became a part of the army hence. Longbow became very popular by the 14th century. They were widely used by the English. The 16th century brought guns and changed the warfare altogether. It was followed by use of grenades in the next century. Modern weapons came into existence from the 19th century and included machine guns, airplanes, jet planes and nuclear weapons.