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Plutarch, Life of Demetrius 35.1
Ἐχομένων δὲ τῶν Ἀθηνῶν, εὐθὺς ἐπεβούλευε τῇ Λακεδαίμονι, καὶ περὶ Μαντίνειαν Ἀρχιδάμου τοῦ βασιλέως ἀπαντήσαντος αὐτῷ, νικήσας μάχῃ καὶ τρεψάμενος εἰς τὴν Λακωνικὴν ἐνέβαλε, καὶ πρὸς αὐτῇ τῇ Σπάρτῃ πάλιν ἐκ παρατάξεως ἑλὼν εντακοσίους καὶ διαφθείρας διακοσίους, ὅσον οὔπω τὴν πόλιν ἔχειν ἐδόκει, μέχρι τῶν χρόνων ἐκείνων ἀνάλωτον οὖσαν.
And now that he was in possession of Athens, he at once laid plans against Sparta. Near Mantineia, where Archidamus the king confronted him, he conquered and routed his foe, and then invaded Laconia. And after he had fought a second pitched battle hard by Sparta itself, where he captured five hundred men and slew two hundred, it was thought that he as good as had the city in his power, although up to this time it had never been taken. (Loeb translation)
Polyainos Strategemata 4.7.9