The first technique that we can pick out from the poem is antithesis. We can see that in the way he lived before he attended compared to the way he lived after he experienced war. Antithesis can be found in many aspects of these two experiences. First he presents our hero thinking about his past life and how well his past state was "
Owen uses alliteration in order to heighten the effectiveness through the sound of words "Ghastly suit of grey" ,"Play and pleasure" . By doing this he manages to create a darker atmosphere and tone making the reader feel pessimistic and miserable. This technique is combined by our poet pretty well with the appropriate use of diction. Owen makes a selection of words that fit the atmosphere and contribute to it's toll on the reader "morbid", "depressed" , " ghastly".
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There's off rhyme between "lamps" and "glanced" in the second stanza.
There's a simile (comparison using like or as) where Owen says the girls touch him like some queer disease. It's ironic (another poetic device) that nonhuman things (sleep) take on human attributes (the personification of sleep mothering) while the human (the subject himself) becomes inhuman, turns into a disease.
Meter: generally iambic pentameter with variation, another poetic device. The poet establishes a meter but varies it to keep the sound interesting and for emphasis or other effects. For example, the line "Now, he is old; his back will never brace;" starts with a stressed syllable to emphasize the poet's focus on the present.
"Leap of purple spurted from his thigh" is a symbolism. Here, "the leap of purple" is used to represent the blood the soldier uses.
"No fears/Of Fear" is an example of polyptoton, in which a word is repeated in