What are some of the techniques used in the poem, "Disabled," by Wilfred Owen?

There are a variety of poetic techniques Wilfred Owen
employs in "Disabled." Some of them are listed below.

In
the first stanza, Owen uses a simile, and then a
metaphor:

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Through the park 
Voices of boys rang
saddening like a
hymn,

and...

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Voices of play and pleasure after
day, 
Till gathering sleep had mothered them from
him.

There is the use of
href="http://web.cn.edu/kwheeler/lit_terms_I.html">irony as
well:

And half
his lifetime lapsed in the hot race 
And leap of purple spurted from his
thigh. 

One time he liked a blood-smear down his leg, 
After
the matches, carried
shoulder-high...

Whereas cuts
and bruises were something to be proud of after a football game, the loss of blood in
war is totally different, and there will be no celebration after
this injury.

Repetition is used several times in the poem.
At the beginning we see the phrase "voices of..." and later, at the end of the poem,
"Why don't them come?"

Finally, Owen's use of title="imagery"
href="http://web.cn.edu/kwheeler/lit_terms_I.html#imagery_anchor">imagery
is extremely impactful:

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He's lost his colour very far from
here, 
Poured it down shell-holes till the veins ran dry, 
And half
his lifetime lapsed in the hot race 
And leap of purple spurted from his
thigh.

Owen, a soldier and
poet in World War I, who was himself killed in that war (one week before the title="armistice"
href="http://dictionary.reference.com/browse/armistice">armistice was
signed), humanizes the experiences of the battlefield and the sacrifices made there,
timelessly memorializing such actions, regardless of the era.