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[[File:600px-Victory_stele_of_Naram_Sin_9066.jpg|thumbnail|left|600px|Figure 1. Stele of Naram-Sin (2254–2218 BC), an Akkadian king, standing over his enemies and who likely employed professional soldiers in his empire as he created a larger empire|200px]]

Warfare has been a constant throughout human history and conflict can certainly be traced back to our hominid ancestors in our evolutionary past. While technology today is often used as the distinguishing characteristic of warfare, the development of the professional army, that is fulltime soldiers and formations of a standing army, was also an important factor in making warfare an affair conducted throughout the year and allowed the establishment of large-scale states and empires to be possible.<ref>For general information about the history of war and armies, see: Chaliand, Gérard, ed. 1994. ''The Art of War in World History: From Antiquity to the Nuclear Age''. Berkeley: University of California Press.</ref> This also paved the way for early states and empires to compete more with each other, helping to develop a variety of other social and technical innovations, including shaping our own world.