The purpose of the Late Roman Draco standard.

[D B Campbell]

I don't want to spoil your fun, Moi. But here's a wee taster:

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They charge, distinguished (i.e., identified) by signs (i.e., banners), not only Roman ones but also Scythian ones, so that their riding becomes more colourful and, at the same time, more frightening.

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The Scythian banners are serpents hanging down from poles of the appropriate length. They are made of dyed remnants (i.e. strips of cloth) sewn together, their heads and entire body right down to their tails resembling snakes, in order to appear most fearful.