Passage 1.13.6
πρώτης δὲ γενομένης σφίσι συμφορᾶς ἐν Βοιωτοῖς, ὕστερον Ἀντιπάτρῳ καὶ Μακεδόσι μεγάλως προσέπταισαν· τρίτος δὲ ὁ Δημητρίου πόλεμος κακὸν ἀνέλπιστον ἦλθεν ἐς τὴν γῆν. Πύρρου δὲ ἐσβαλόντος τέταρτον δὴ τότε στρατὸν ὁρῶντες πολέμιον αὐτοί τε παρετάσσοντο καὶ Ἀργείων ἥκοντες καὶ Μεσσηνίων σύμμαχοι· Πύρρος δὲ ὡς ἐπεκράτησεν, ὀλίγου μὲν ἦλθεν ἑλεῖν αὐτοβοεὶ τὴν πόλιν, δῃώσας δὲ τὴν γῆν καὶ λείαν ἐλάσας μικρὸν ἡσύχαζεν. οἱ δὲ ἐς πολιορκίαν εὐτρεπίζοντο, πρότερον ἔτι τῆς Σπάρτης ἐπὶ τοῦ πολέμου τοῦ πρὸς Δημήτριον τάφροις τε βαθείαις καὶ σταυροῖς τετειχισμένης ἰσχυροῖς, τὰ δὲ ἐπιμαχώτατα καὶ οἰκοδομήμασιν.
After their first disaster in Boeotia, they subsequently suffered greatly at the hands of Antipater and the Macedonians, and thirdly came the war with Demetrius, which brought unexpected misfortune to their land. When Pyrrhus invaded, bringing the fourth hostile army down upon them, they set themselves in battle array along with the allies who arrived from Argos and Messene. Pyrrhus, when he had gained the upper hand, almost took the city by a direct assault; however, having ravaged the territory and driven off booty, he paused briefly. The Spartans then prepared themselves for a siege. Still earlier, during their war against Demetrius, Sparta had been fortified with trenches, deep moats, and strong palisades, and at its most vulnerable points even buildings had been constructed as fortifications.