Passage 7.16.7
Ἀχαιῶν δὲ οἱ ἐς Κόρινθον ἀποσωθέντες μετὰ τὴν μάχην ἀπεδίδρασκον ὑπὸ νύκτα εὐθύς· ἀπεδίδρασκον δὲ καὶ αὐτῶν Κορινθίων οἱ πολλοί. Μόμμιος δὲ τὸ μὲν παραυτίκα, ἀναπεπταμένων ὅμως τῶν πυλῶν, ἐπεῖχεν ἐς τὴν Κόρινθον παρελθεῖν, ὑποκαθῆσθαί τινα ἐντὸς τοῦ τείχους ὑποπτεύων ἐνέδραν· τρίτῃ δὲ ἡμέρᾳ μετὰ τὴν μάχην ᾕρει τε κατὰ κράτος καὶ ἔκαιε Κόρινθον.
Those of the Achaeans who survived the battle and managed to escape into Corinth fled immediately by night; most of the Corinthians themselves also deserted. Mummius, however, hesitated at first to advance directly into Corinth, although its gates were still wide open, suspecting that an ambush lay waiting within its walls. On the third day after the battle, he assaulted and captured Corinth by storm and set it on fire.