The Epic of Gilgamesh,

written down in about the eighteenth century B.C. in Mesopotamia, one of the earliest centres of civilisation, shows that most weapons of war had been invented by then, the major exception being explosives, which were to be invented by the Chinese almost 2800 years later.
Gilgamesh, a hero of Uruk in Babylonia, fought with axe, sword, bow and arrow, and spear. His contemporaries used battering rams against enemy cities, and rode to battle in chariots.
The concept of a martial art or science of combat no doubt developed along with civilisation. Organised warfare required trained and disciplined soldiers, and generals and instructors to command and train them.
The earliest accepted evidence of a martial art exists in two small Babylonian works of art dating back to between 2000 and 3000 B.C., each showing two men in postures of combat.