Passage 10.26.6
ἀσφάλειαν δὲ ἀποχρῶσαν ἐδόκει παρέχεσθαι καὶ ἀσπίδος χωρίς· ἐπὶ τούτῳ καὶ Ὅμηρος Φόρκυνα τὸν Φρύγα οὐκ ἔχοντα ἀσπίδα ἐποίησεν, ὅτι αὐτῷ γυαλοθώραξ ἦν. ἐγὼ δὲ γραφῇ μεμιμημένον τοῦτον ἐθεασάμην ὑπὸ τοῦ Πολυγνώτου, καὶ ἐν Ἀρτέμιδος τῆς Ἐφεσίας Καλλιφῶν ὁ Σάμιος Πατρόκλῳ τοῦ θώρακος τὰ γύαλα ἁρμοζούσας ἔγραψε γυναῖκας.
They considered that even without a shield it provided sufficient protection. Concerning this matter, Homer also depicted Phorcys the Phrygian as being without a shield because he wore a breastplate of metal plates. I myself saw this image reproduced in a painting by Polygnotus; and at the temple of Artemis at Ephesus, Calliphon of Samos painted women fitting metal plates of armor onto Patroclus' breastplate.