Passage 6.20.4
λέγεται δὲ καὶ Ἀρκάδων ἐς τὴν Ἠλείαν ἐσβεβληκότων στρατιᾷ καὶ τῶν Ἠλείων σφίσιν ἀντικαθημένων γυναῖκα ἀφικομένην παρὰ τῶν Ἠλείων τοὺς στρατηγούς, νήπιον παῖδα ἔχουσαν ἐπὶ τῷ μαστῷ, λέγειν ὡς τέκοι μὲν αὐτὴ τὸν παῖδα, διδοίη δὲ ἐξ ὀνειράτων συμμαχήσοντα Ἠλείοις. οἱ δὲ ἐν ταῖς ἀρχαῖς---πιστὰ γὰρ τὴν ἄνθρωπον ἡγοῦντο εἰρηκέναι---τιθέασι τὸ παιδίον πρὸ τοῦ στρατεύματος γυμνόν.
It is said also that when the Arcadians invaded Elis with an army and the Eleans had encamped opposite them, a woman came to the Elean generals carrying an infant child at her breast, declaring that the child was hers by birth, but that she offered it according to a dream she had seen, as a helper in war for the Eleans. The Elean magistrates—believing that she had spoken truthfully—placed the child naked before the army.