Passage 2.8.5
ἐλευθερώσαντος δὲ Ἀράτου Κόρινθον προσεχώρησαν μὲν ἐς τὸ συνέδριον Ἐπιδαύριοι καὶ Τροιζήνιοι οἱ τὴν Ἀργολίδα Ἀκτὴν οἰκοῦντες καὶ τῶν ἐκτὸς ἰσθμοῦ Μεγαρεῖς, συμμαχίαν δὲ πρὸς Ἀχαιοὺς Πτολεμαῖος ἐποιήσατο. Λακεδαιμόνιοι δὲ καὶ Ἆγις ὁ Εὐδαμίδου βασιλεὺς ἔφθησαν μὲν Πελλήνην ἑλόντες ἐξ ἐπιδρομῆς, ἥκοντι δὲ Ἀράτῳ καὶ τῇ στρατιᾷ συμβαλόντες ἐκρατήθησαν καὶ τὴν Πελλήνην ἐκλιπόντες ἀναχωροῦσιν οἴκαδε ὑπόσπονδοι.
After Aratus liberated Corinth, the Epidaurians and the Troezenians, who inhabited the Argolic coast, together with the Megarians outside the Isthmus, joined the Achaean league. Ptolemy also formed an alliance with the Achaeans. But the Lacedaemonians, and their king Agis son of Eudamidas, had already swiftly captured Pellene in a sudden raid; nevertheless, when Aratus arrived with his army and battle was joined, they were defeated, abandoned Pellene, and withdrew homeward under a truce.