Vexillatio
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A vexillatio (pl.: vexillationes) was a detachment of a Roman legion formed as a temporary task force created by the Roman army of the Principate. It was named from the standard carried by legionary detachments, the vexillum (pl.: vexilla), which bore the emblem and name of the parent legion.
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Although commonly associated with legions, it is likely that vexillationes included auxiliaries. The term is found in the singular, referring to a single detachment, but is usually used in the plural to refer to an army made up of picked detachments. Vexillationes were assembled ad hoc to meet a crisis on Rome's extensive frontiers, to fight in a civil war, or to undertake an offensive against Rome's neighbours. They varied in size and composition, but usually consisted of about 1000 infantry and/or 500 cavalry.