Passage 4.15.7
ἐνιαυτῷ δὲ ὕστερον τοῦ περὶ τὰς Δέρας ἀγῶνος, ἡκόντων ἀμφοτέροις καὶ τῶν συμμάχων, παρεσκευάζοντο ὡς μάχην συνάψοντες ἐπὶ τῷ καλουμένῳ Κάπρου σήματι. Μεσσηνίοις μὲν οὖν Ἠλεῖοι καὶ Ἀρκάδες, ἔτι δὲ ἐξ Ἄργους ἀφίκετο καὶ Σικυῶνος βοήθεια. παρῆσαν δὲ καὶ ὅσοι πρότερον τῶν Μεσσηνίων ἔφευγον ἑκουσίως, ἐξ Ἐλευσῖνός τε, οἷς πάτριον δρᾶν τὰ ὄργια τῶν Μεγάλων θεῶν, καὶ οἱ Ἀνδροκλέους ἀπόγονοι· καὶ γὰρ οἱ συσπεύσαντες μάλιστά σφισιν ἦσαν οὗτοι.
A year after the battle about the Boar's Tomb, allies arriving to support both sides, they prepared to engage in battle near the place called the Grave of Kapros. The Messenians had assistance from the Eleans and Arcadians, and further aid came also from Argos and Sicyon. Present, too, were those Messenians who had previously fled their homeland voluntarily, coming both from Eleusis—where they were accustomed ancestrally to perform the rites of the Great Goddesses—and likewise the descendants of Androcles. For these above all had readily moved to their aid.