Passage 6.19.12
Μεγαρεῖς δὲ οἱ πρὸς τῇ Ἀττικῇ θησαυρόν τε ᾠκοδομήσαντο καὶ ἀναθήματα ἀνέθεσαν ἐς τὸν θησαυρὸν κέδρου ζῴδια χρυσῷ διηνθισμένα, τὴν πρὸς Ἀχελῷον Ἡρακλέους μάχην· Ζεὺς δὲ ἐνταῦθα καὶ ἡ Δηιάνειρα καὶ Ἀχελῷος καὶ Ἡρακλῆς ἐστιν, Ἄρης τε τῷ Ἀχελῴῳ βοηθῶν. εἱστήκει δὲ καὶ Ἀθηνᾶς ἄγαλμα ἅτε οὖσα τῷ Ἡρακλεῖ σύμμαχος· αὕτη παρὰ τὰς Ἑσπερίδας ἀνάκειται νῦν τὰς ἐν τῷ Ἡραίῳ.
The Megarians who border Attica built a treasury, dedicating therein certain votive offerings, carved figures of cedar wood adorned with gold, depicting the battle between Heracles and Achelous. Zeus appears here, as do Deianeira, Achelous and Heracles himself, and also Ares supporting Achelous. There stood also a statue of Athena, who was allied to Heracles; this statue now stands beside the Hesperides in the Heraeum.