A one of a kind handwritten copy of Joy Bells by Siegfried Sassoon is valued at £1,500 ($2,400) ahead of Bonhams' November 12 Books, Maps, Manuscripts and Historical Photographs auction.
The poem dates to November 23, 1917, three days before Sassoon (1886-1967) was discharged from Craiglockhart - a military hospital near Edinburgh where he was sent following his protest against the war earlier in the year.
It was here that he met fellow poet Wilfred Owen, who was to die at Ors in 1918 - a week before the armistice.
The poem attacks the Church of England for its support of the conflict and its duplicity in encouraging men to fight in an unjust war for the glory of god.
Sign up to our free newsletter for the latest from the world of collecting.