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Velites (singular: veles) were a class of infantry in the Polybian legions of the early Roman republic. Velites were light infantry and skirmishers who were armed with a number of light javelins, or hastae velitares, to fling at the enemy, and also carried short thrusting swords, or gladii for use in melee. They rarely wore armour, as they were the youngest and poorest soldiers in the legion and could not afford much equipment. They did carry small wooden shields for protection though, and wore a headdress made from wolf skin to allow officers to differentiate between them and other heavier legionaries.
Velites did not form their own units; a number of them were attached to each maniple of hastati, principes and triarii. They were typically used as a screening force, driving off enemy skirmishers and disrupting enemy formations with javelin throws before retiring behind the lines to allow the heavier armed hastati to attack. They were normally the ones who engaged war elephants and chariots if they were present on the field; their high mobility and ranged weaponry made them much more effective against these enemies than heavy infantry. An early Roman legion contained approximately 1,000 velites. Velites were eventually done away with after the Marian reforms.
Equipment and organization 
Velites were the youngest and usually the poorest soldiers in the legion, and could rarely afford much equipment. They were armed with hastae velitares, light javelins with tips designed to bend on impact to prevent it being thrown back, similar to the heavier pila of other legionaries. As backup weapons, they also carried gladii, relatively short thrusting swords 74 centimetres (29 inches) in length that were the main weapons of the hastati and principes. They fought in a very loose, staggered formation like most irregular troops and carried small round shields, 90 cm (3 feet) in diameter.
In the legion, the velites were attached to each maniple of hastati, principes and triarii. They usually formed up at the front of the legion before battle to harass the enemy with javelin throws and to prevent the enemy doing the same before retiring behind the lines to allow the heavier infantry to attack. In a pitched battle, the velites would form up at the front of the legion and cover the advance of the hastati, who were armed with swords, and were the first line of attack. If the hastati failed to break the enemy, they would fall back and let the principes, similarly equipped though more experienced infantry, take over. If the principes failed, they would retire behind the triarii, heavily armoured, spear armed legionaries and let them carry on.
Velites were descended from an earlier class of light infantry, leves, dating from the Camillan legion of the 5th century BC, who had a very similar role to the velites. They were also the poorer and younger soldiers in the legion, though the rorarii and accensi classes were considerably poorer and were eventually done away with, having insufficient equipment to be effective soldiers. Leves were likewise armed with a number of javelins, but carried a spear rather than a sword. Like the velites, leves did not have their own units, but were attached to units of hastati.
Velites were first used at the siege of Capua in 211 BC, and were made up of citizens who would normally be too poor to join the hastati but where called up due a shortage of manpower. They were trained to ride on horseback with the Equites and jump down at a given signal to fling javelins at the enemy. After the siege, they were adopted into the legions as a force of irregular light infantry for ambushing and harassing the enemy with javelins before the battle began in earnest.
With the formal military reforms of Gaius Marius in 107 BC, designed to combat a shortage of manpower due to wars against Jugurtha, the different classes of units were done away with entirely. The wealth and age requirements were scrapped. Now soldiers would join as a career, rather than as service to the city, and would all be equipped as medium infantry with the same, state purchased equipment. Auxilliae, local irregular troops, would now be used to fulfill other roles such as archery, skirmishing and flanking.
See also 
- Southern, Pat. The Roman Army: A Social and Institutional History. Oxford university press. p. 92. ISBN 0-19-532878-7.
- Mommsen, Theodor. The History of Rome, Book III: From the union of Italy to the subjugation of Carthage and the Greek states. The History of Rome.
- Smith, William. A Dictionary of Greek and Roman Antiquities. Little, Brown, and Co. p. 496.
- Penrose, Jane. Rome and Her Enemies: An Empire Created and Destroyed by War. Osprey publishing. p. 33. ISBN 1-84176-932-0.
- Smith, William. A Dictionary of Greek and Roman Antiquities. Little, Brown, and Co. p. 501.
- Southern, Pat. The Roman Army: A Social and Institutional History. Oxford university press. p. 90. ISBN 0-19-532878-7.
- Southern, Pat. The Roman Army: A Social and Institutional History. Oxford university press. p. 94. ISBN 0-19-532878-7.
- Smith, William. A Dictionary of Greek and Roman Antiquities. Little, Brown, and Co. p. 506.