New Zealand troops at the Battle of the Somme, 1916.
British soldiers in gas masks in a look-out post at the front, where they communicate with radio, 1917.
A German infantry battalion crosses a muddy landscape of barbed wire and parapets, 1916.
A French bridge near Ham blown by the retreating Germans, 1917.
Official German army photographer, western front, World War I.
A series of trenches, structures on fire, in a French war zone during World War I.
General Eric Ludendorff inspecting Jagdstaffel 11 near Marckebeke, Belgium. Manfred von Richthofen’s red-painted Albatros, can be seen in the background.
Men and dogs of a Belgian machine gun section during the retreat to Antwerp, 20 August 1914. This picture completed a hundred years two days ago.
French soldier with a pet fox, World War I.
Soldiers of the Russian Caucasus Army in the forests of Sarikamish, World War I.