Passage 10.21.7
ὀλιγώρως δὲ αὐτοὺς ἐς τῶν ἀπογινομένων ἔχειν τὰς ταφὰς δύο ἐμοὶ δοκεῖν τὰ ἀναπείθοντα ἦν, πολεμίους τε ἄνδρας ἐκπλῆξαι καὶ ὅτι ἔστι τεθνεώτων οὐ διʼ ἔθους οἶκτος αὐτοῖς. ἀπέθανον δὲ παρὰ τὴν μάχην τεσσαράκοντα μὲν τοῦ Ἑλληνικοῦ, τοὺς δὲ τῶν βαρβάρων οὐχ οἷόν τε ἦν ἀκριβῶς ἐξευρεῖν· πολὺ γὰρ καὶ τὸ ἀφανισθὲν κατὰ τῆς ἰλύος ἐγένετο ἐξ αὐτῶν.
Two reasons seem to me to have persuaded them to be negligent in burying their dead: first, to strike terror in their enemies, and second, because compassion for those who have died is not usual among them. In this battle, forty Greeks fell, but it was impossible to ascertain accurately the number of barbarians killed, since many had disappeared into the mud.