[424] For the repeated ὥς, marking a break in the story, cf. 6.311-12, 22.515 - 23.1. σιδ́ηρειος, apparently=inflexible, i.e. indomitable, unwearying; cf. 23.177 “πυρὸς μένος σιδήρεον”, and 20.372 “ἔοικε μένος αἴθωνι σιδήρωι”. The juxtaposition of χάλκεον οὐρανόν is awkward, as it seems to imply an antithesis of the two metals, which of course does not exist.