Most activity in front line trenches took place at night under cover of darkness. During daytime soldiers would try to get some rest, but were usually only able to sleep for a few hours at a time.
The following photos were taken from 1914-1918 by my great-grandfather Lt. Walter Koessler during his time as a German officer in the first World War.
Battle of the Somme
First Attack on Mametz Wood (7)
Cardiff Men at Mametz Wood, 12th July 1916
French 87th regiment near Verdun 1916.
Up and at 'em! British soldiers go into action, but the man in the foreground has fallen before even leaving the trench. Note the reinforced concrete bunkers in the background which have already suffered heavy artillery pounding
"Germans bombing all day. Poilus bury themselves in their holes." Verdun1916 (@1916_Verdun) | Twitter
In The Trenches Of World War II Vintage 8x10 Reprint Of Old Photo
Hole in the Helmet - “Saved by shrapnell [sic] helmet. This soldier, on the way to hospital after being bandaged at Field Dressing Station, shows the helmet which saved his life.” 1914-1918.