'An important sector of the Hindenburg defences as seen at 8,000 ft showing series of elaborate trenches', 1917 (c)

Photograph, World War One, Western Front (1914-1918), 1917 (c).

Between February and April 1917 the German forces on the Western Front pulled back to the Hindenburg Line, a defensive position that shortened their front by 80 kilometres (50 miles). Deep belts of wire and concrete pillboxes made the line a formidable barrier but this did not prevent the Allies from renewing their assaults.

From a collection of one hundred and one stereoscopic photographs in box one of two entitled 'The Great War'.