Note 617 — Chapter XXXVI · FROM THE IONIC REVOLT TO THE BATTLE OF MARATHON.
Reading edition
Herodot. vi, 94. ἐντειλάμενος δὲ ἀπέπεμπε, ἐξανδραποδίσαντας Ἐρετρίαν καὶ Ἀθήνας, ἄγειν ἑωϋτῷ ἐς ὄψιν τὰ ἀνδράποδα.
According to the Menexenus of Plato (c. 17, p. 245), Darius ordered Datis to fulfil this order on peril of his own head; no such harshness appears in Herodotus.