Ypres, 1917 depicts an attack on a pillbox in the Nonne Bosschen swamp, east of Ypres, during the advance astride Menin Road on 20 September 1917.
Work began on the diorama in 1922. It was previously referred to as Overcoming the Pillbox, Nonne Boschen and Attacking a Pillbox in Nonne Boschen Swamp. Its present gallery title is Ypres, 1917. The work was first displayed at the Memorial in Aeroplane Hall and was relocated to the Western Front gallery in 1970.