Histories

But the Scythian race has made the cleverest discovery that we know in what is the most important of all human affairs; I do not praise the Scythians in all respects, but in this, the most important: that they have contrived that no one who attacks them can escape, and no one can catch them if they do not want to be found.

For when men have no established cities or forts, but are all nomads and mounted archers, not living by tilling the soil but by raising cattle and carrying their dwellings on wagons, how can they not be invincible and unapproachable?