"The British Army on the Western Front, 1914-1918" Men of the York and Lancaster Regiment, probably 2/4th Battalion part of the 187th Brigade, check a machine gun mounted in a trench on the 62nd Division Front between Oppy and Gavrelle. Another man uses a trench periscope while another collects some water. A Lewis gun in a bay of the trench, 13 January, 1918.