German army respirator case, 1917

This case is related to a German army respirator which belonged to a soldier in a German Guards regiment. It was collected by Lt Col Henry Jourdain of the Connaught Rangers during the attack at Langemarck between 16 and 18 August 1917. Langemarck was the second Allied attack of the 3rd Battle of Ypres and the drive towards Passchendaele.