Passage 10.26.5
γέγραπται δὲ βωμός τε καὶ ὑπὸ δείματος παῖς μικρὸς ἐχόμενος τοῦ βωμοῦ· κεῖται δὲ καὶ θώραξ ἐπὶ τῷ βωμῷ χαλκοῦς. κατὰ δὴ ἐμὲ σπάνιον τῶν θωράκων τὸ σχῆμα ἦν τούτων, τὸ δὲ ἀρχαῖον ἔφερον αὐτούς. δύο ἦν χαλκᾶ ποιήματα, τὸ μὲν στέρνῳ καὶ τοῖς ἀμφὶ τὴν γαστέρα ἁρμόζον, τὸ δὲ ὡς νώτου σκέπην εἶναι ---γύαλα ἐκαλοῦντο---· τὸ μὲν ἔμπροσθεν τὸ δὲ ὄπισθεν προσῆγον, ἔπειτα περόναι συνῆπτον πρὸς ἄλληλα.
There is depicted an altar and also a small boy clutching the altar in fear; set upon the altar is a bronze cuirass. In my opinion, the shape of these cuirasses was uncommon, yet it was the ancient form that they bore. They consisted of two bronze pieces: one fitted for the chest and the parts around the belly, and the other designed as protection for the back—they were called "gyala." They would bring the one piece to the front and the other to the back and then fasten them together with pins.