A ration party from (probably) 1st Battalion Royal Irish Rifles ( 25th Brigade, 8th Division) in a trench during the Somme offensive. The date is (probably) 1 July 1916, the first day of the offensive when British army suffered 60.000 casualties.
Digging trenches near Grodno, Belarus. From a World War I album. Life in the trenches during the First World War took many forms, and varied widely from sector to sector and from front to front. http://www.firstworldwar.com/features/trenchlife.htm