Passage 1.10.2
τούτων ἕνεκα Δημητρίῳ συμβαλὼν πρὸς Ἀμφιπόλει παρʼ ὀλίγον μὲν ἦλθεν ἐκπεσεῖν Θρᾴκης, ἀμύναντος δέ οἱ Πύρρου τήν τε Θρᾴκην κατέσχε καὶ ὕστερον ἐπῆρξε Νεστίων καὶ Μακεδόνων· τὸ δὲ πολὺ Μακεδονίας αὐτὸς Πύρρος κατεῖχε, δυνάμει τε ἥκων ἐξ Ἠπείρου καὶ πρὸς Λυσίμαχον ἐν τῷ παρόντι ἔχων ἐπιτηδείως. Δημητρίου δὲ διαβάντος ἐς τὴν Ἀσίαν καὶ Σελεύκῳ πολεμοῦντος, ὅσον μὲν χρόνον ἀντεῖχε τὰ Δημητρίου, διέμεινεν ἡ Πύρρου καὶ Λυσιμάχου συμμαχία· γενομένου δὲ ἐπὶ Σελεύκῳ Δημητρίου Λυσιμάχῳ καὶ Πύρρῳ διελύθη ἡ φιλία, καὶ καταστάντων ἐς πόλεμον Λυσίμαχος Ἀντιγόνῳ τε τῷ Δημητρίου καὶ αὐτῷ Πύρρῳ πολεμήσας ἐκράτησε παρὰ πολὺ καὶ Μακεδονίαν ἔσχεν, ἀναχωρῆσαι Πύρρον βιασάμενος ἐς τὴν Ἤπειρον.
Because of these events, when Lysimachus fought Demetrius near Amphipolis, he came very close to losing Thrace; but thanks to the support afforded him by Pyrrhus, he retained Thrace and later gained control over the Nestians and Macedonians. Nevertheless, Pyrrhus himself held most of Macedonia, since he had come with a powerful force from Epirus and at the time maintained friendly relations with Lysimachus. When Demetrius crossed into Asia and began to wage war against Seleucus, as long as Demetrius was able to hold his own, the alliance between Pyrrhus and Lysimachus endured. But once Seleucus had overcome Demetrius, friendship between Lysimachus and Pyrrhus dissolved. Conflict ensued, and Lysimachus, fighting against Antigonus, the son of Demetrius, and Pyrrhus himself, was victorious and claimed Macedonia by a large margin, forcing Pyrrhus to withdraw to Epirus.