Passage 10.23.4
τοιούτοις μὲν οἱ βάρβαροι παρὰ πᾶσαν τὴν ἡμέραν παθήμασί τε καὶ ἐκπλήξει συνείχοντο· τὰ δὲ ἐν τῇ νυκτὶ πολλῷ σφᾶς ἔμελλεν ἀλγεινότερα ἐπιλήψεσθαι. ῥῖγός τε γὰρ ἰσχυρὸν καὶ νιφετὸς ἦν ὁμοῦ τῷ ῥίγει, πέτραι τε ἀπολισθάνουσαι τοῦ Παρνασσοῦ μεγάλαι τε καὶ κρημνοὶ καταρρηγνύμενοι σκοπὸν τοὺς βαρβάρους εἶχον, καὶ αὐτοῖς οὐ κατὰ ἕνα ἢ δύο ἀλλὰ κατὰ τριάκοντα καὶ ἔτι πλείοσιν, ὡς ἕκαστοι ἐν τῷ αὐτῷ φρουροῦντες ἢ καὶ ἀναπαυόμενοι τύχοιεν, ἀθρόοις ἡ ἀπώλεια ἐγένετο ὑπὸ τῆς ἐμβολῆς τῶν κρημνῶν.
Throughout the entire day, the barbarians were thus overwhelmed by sufferings and terror, yet the sufferings coming upon them during the night were destined to be far more grievous. For there came a severe frost, accompanied by heavy snowfall, and there were great rocks slipping from Parnassus and precipices breaking away, all aimed, as it seemed, at the barbarians; and these, falling not individually or by twos, but upon groups of thirty or even more, as the men were stationed on guard or resting together, destroyed many at once through the impact of the falling cliffs.