Parthian Empire
Military

The Parthian Empire had no standing army, yet were able to quickly recruit troops in the event of local crises. There was a permanent armed guard attached to the person of the king, comprising nobles, serfs and mercenaries, but this royal retinue was small. Garrisons were also permanently maintained at border forts; Parthian inscriptions reveal some of the military titles granted to the commanders of these locations. Military forces could also be used in diplomatic gestures. For example, when Chinese envoys visited Parthia in the late 2nd century BC, the Shiji maintains that 20,000 horsemen were sent to the eastern borders to serve as escorts for the embassy, although this figure is perhaps an exaggeration.

The main striking force of the Parthian army was its cataphracts, heavy cavalry with man and horse decked in mailed armor. The cataphracts were equipped with a lance for charging into enemy lines, but were not equipped with bows and arrows which were restricted to horse archers. Due to the cost of their equipment and armor, cataphracts were recruited from among the aristocratic class who, in return for their services, demanded a measure of autonomy at the local level from the Arsacid kings. The light cavalry was recruited from among the commoner class and acted as horse archers; they wore a simple tunic and trousers into battle. They used composite bows and were able to shoot at enemies while riding and facing away from them; this technique, known as the Parthian shot, was a highly effective tactic. It appears that most of the Parthian army was cavalry, for tactical and strategic reasons. The light cavalry is thought to have carried a sword into battle as well, while cataphracts likely were also armed with short swords or knives. The Parthians also made use of the camel in armed combat. The heavy and light cavalry of Parthia proved to be a decisive factor in the Battle of Carrhae where a Parthian force defeated a much larger Roman army under Crassus.Light infantry units, composed of levied commoners and mercenaries, were used to disperse enemy troops after cavalry charges.

The Parthians do not appear to have ever used war chariots in battle. However, royal Parthian women accompanied the king on military campaigns and were known to have ridden on chariots and wagons. Similarly, the Parthians appeared to have used war elephants infrequently. There is one mention, by Tacitus and Cassius Dio, of the use of one war elephant by Vologases I during the Roman–Parthian War of 58–63.

The size of the Parthian army is unknown, as is the size of the empire's overall population. However, archaeological excavations in former Parthian urban centers reveal settlements which could have sustained large populations and hence a great resource in manpower. Dense population centers in regions like Babylonia were no doubt attractive to the Romans, whose armies could afford to live off the land. The largest army raised by the Parthians appears to have been 50,000.
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