A standing army is a permanent, often professional, army. It is composed of full-time soldiers who may be either career soldiers or conscripts. It differs from army reserves, who are enrolled for the long term, but activated only during wars or natural disasters, and temporary armies, which are raised from the civilian population only during a war or threat of war, and disbanded once the war or threat is over. Standing armies tend to be better equipped, better trained, and better prepared for emergencies, defensive deterrence, and particularly, wars. The term dates from approximately 1600 CE, although the phenomenon it describes is much older. History Ancient history Mesopotamia Sargon of Akkad, the founder of the Akkadian Empire, is believed to have formed the first standing professional army. Tiglath-Pileser III of Assyria (ruled 745–727 BC) created Assyria's first standing army. Tiglath-Pileser III disbanded militias and instead paid professional soldiers for their services. His army was composed largely of Assyrian soldiers, but was supplemented with foreign mercenaries and vassal states. The standing army he created was the most sophisticated administrative and economic institution of its time, and was the engine of Assyrian economy which capitalized on warfare. Ancient Greece In ancient Greece, the city-states' (poleis) armies were essentially drafted citizen militias. The exception was in ancient Sparta, which had a standing army that trained year-round (and not only in summertime). Through the 5th century, they comprised the only professional soldiers in ancient Greece, aside from hired mercenaries. However, the Spartan army commonly consisted of helots (serfs), who considerably outnumbered the Spartiates, as well as numerous allies of Sparta. Philip II of Macedon instituted the first true professional Hellenic army, with soldiers and cavalrymen paid for their service year-round, rather than a militia of men who mostly farmed the land for subsistence and occasionally mustered for campaigns. Ancient China The Western Zhou maintained a standing army, enabling them to effectively control other city states and spread their influence. Unlike the Western Zhou, the Eastern Zhou initially did not have a standing army. Instead they drafted militias from around 150 city states. While the Eastern Zhao did not initially maintain a standing army, the state of Jin became the first to do so in 678 BCE. The first professional army in China was established by the Qin dynasty in 221 BCE, which ushered Imperial China. Under the Qin dynasty, wars were fought by trained