Passage 7.8.5
καὶ σφᾶς ὑπὸ τὸν χρόνον οἱ Ἀχαιοὶ τοῦτον ἐς σύλλογον ὑπάγονται τὸν Ἀχαϊκὸν καὶ δίκας τε ἐδίκαζόν σφισιν ἐς τὸ ἀκριβέστατον καὶ τὰ τείχη τῆς Σπάρτης καταβάλλουσιν ἐς ἔδαφος, οἰκοδομηθέντα μὲν καὶ πρότερον ἔτι αὐτοσχεδίως καὶ ἐπί τε τῆς Δημητρίου καὶ ὕστερον τῆς Πύρρου καὶ Ἠπειρωτῶν στρατείας, ἐπὶ δὲ τῆς τυραννίδος τῆς Νάβιδος καὶ ἐς τὸ ἀσφαλέστατον ὀχυρωθέντα. τά τε οὖν τείχη τῆς Σπάρτης οἱ Ἀχαιοὶ καθεῖλον καὶ τὰ ἐς μελέτην τοῖς ἐφήβοις ἐκ τῶν Λυκούργου νόμων καταλύσαντες ἐπέταξαν τοῖς Ἀχαιῶν ἐφήβοις τὰ αὐτὰ ἐπιτηδεύειν.
Around this time the Achaeans brought them into the Achaean League assembly, judged their legal cases with the utmost strictness, and demolished completely the walls of Sparta—walls that had previously been hastily built during the campaigns of Demetrios and later again during those of Pyrrhus and the Epeirotes, and had been especially strengthened and fortified securely under the tyranny of Nabis. Thus the Achaeans tore down the city walls, abolished the athletic practices for youth established by the laws of Lycurgus, and compelled the Spartan youths to adopt instead the same customs used by the youths of Achaea.