Do not go gentle into that good night is metered how?

Dylan Thomas' "Do not go gentle into that good night" follows an iambic pentameter. For that reason, each line of the poem (except the second one of the fifth stanza Blind eyes could blaze like meteors and be gay,) has ten syllables (five feet). Each foot follows the same pattern: one unstressed syllable followed by a stressed syllable and so on as in the example

Wild men | who caught | and sang | the sun | in flight

The stressed syllable is in bold.