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Bartleby.com: Siegfried Sassoon
http://www.bartleby.com/people/Sassoon.html
Many of his works available online.
Modern History Sourcebook: Attack
http://www.fordham.edu/halsall/mod/sassoon-attack.html
HTML text of the poem.
The Old Huntsman and Other Poems
http://www.bartleby.com/135/
HTML version.