5925395 Snowball fight, February 1917 (lantern slide) by Unknown photographer, (20th century); National Army Museum, London; (add.info.: Snowball fight, February 1917. Lantern slide, World War One, Western Front (1914-1918), 1917. Soldiers enjoy a snowball fight outside the divisional baths on the Arras Road near St. Pol. In a typical month an infantryman might expect to be in the line for a week or ten days, during which he would spend several 48 hour shifts in the front line itself. This might be followed by a week in support, and then as much as two weeks resting out of the trenches. From a box of 73 lantern slides.); by National Army Museum ; out of copyright.