The Histories · 4.136

But when it was day, those who were left behind perceived that they had been betrayed by Dareios, and they held out their hands in submission to the Scythians, telling them what their case was; and the Scythians, when they heard this, joined together as quickly as possible, that is to say the two combined divisions of the Scythians and the single division, and also the Sauromatai, Budinoi, and Gelonians, and began to pursue the Persians, making straight for the Ister: but as the Persian army for the most part consisted of men on foot, and was not acquainted with the roads (the roads not being marked with tracks), while the Scythian army consisted of horsemen and was acquainted with the shortest cuts along the way, they missed one another and the Scythians arrived at the bridge much before the Persians. Then having learnt that the Persians had not yet arrived, they said to the Ionians…

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
Source edition
Passage preview. Read in context for the complete text, notes and references.