5923041 Leaving to repair the line near Villers-Bretonneux, 1916 circa (b/w photo) by Unknown photographer, (20th century); National Army Museum, London; (add.info.: Leaving to repair the line near Villers-Bretonneux, 1916 circa. Stereoscopic photograph, World War One, Western Front, 1916 circa. All front-line regiments detailed working parties to undertake tasks such as repairs and extensions to the trench systems, reconnaissance and, sometimes, recovery of the dead and wounded. Any work in the open meant that they had to operate at night to avoid being picked off by enemy marksmen. But it remained a risky operation as the dazzling white light of flares could still suddenly expose them. From a collection of 96 stereoscopic photographs in box two of two entitled ?The Great War? including the official series.); by National Army Museum ; out of copyright.