Passage 4.11.8
τοὺς δὲ τῶν Λακεδαιμονίων διαφθαρέντας ἐν τῇ μάχῃ συλλαβεῖν μὲν οὐχ οἷά τε ἦν ἀριθμῷ, πείθομαι δὲ εἶναι καὶ αὐτὸς πολλούς. ἡ δὲ οἴκαδε ἀναχώρησις τοῖς μὲν ἄλλοις καθʼ ἡσυχίαν, Κορινθίοις δὲ ἔμελλεν ἔσεσθαι χαλεπή· διὰ πολεμίας γὰρ ἐγίνετο ὁμοίως διά τε τῆς Ἀργείας πειρωμένοις καὶ παρὰ Σικυῶνα ἀνασωθῆναι.
As for how many Lacedaemonians fell in the battle, it was impossible to ascertain their number exactly, though I myself am persuaded that they were numerous. The return journey home was peaceful for most, but it was destined to be difficult for the Corinthians; for their route passed through hostile territory, as they attempted alike to reach safety both through the Argive land and by way of Sicyon.