5922999 ?In the firing line before La Boisselle, awaiting the signal for the dash up the ?Sausage Valley?, 1916 (b/w photo) by Unknown photographer, (20th century); National Army Museum, London; (add.info.: ?In the firing line before La Boisselle, awaiting the signal for the dash up the ?Sausage Valley?, 1916. Photograph, World War One, Western Front (1914-1918), 1916. Sausage Valley was located near Contalmaison. During the Battle of the Somme (1916) it was one of the main routes to the front line. It is said to have been named after a German observation balloon, known as a ?sausage?, that was visible at the head of the valley. From a collection of one hundred and one stereoscopic photographs entitled ?The Great War?.); by National Army Museum .