
The Auxilia (Latin, lit. `helps`) constituted the standing non-citizen corps of the Imperial Roman army during the Principate era (30 BC–284 AD), alongside the citizen legions. By the 2nd century, the Auxilia contained the same number of infantry as the legions and in addition provided almost all of the Roman army`s cavalry and more specialis......
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http://en.wikipedia.org/wiki/Auxilia

Roman auxiliary troops, including units of cavalry and light infantry. They were recruited from noncitizens in the provinces outside Italy and were often employed as provincial garrisons. Pay was...
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http://www.encyclo.co.uk/local/20688

Auxiliaries.
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http://www.encyclo.co.uk/local/20764

(Latin) additional military troops; these troops could have included cavalry, archers, etc.
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https://www.encyclo.co.uk/local/10135
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