Magic lantern slide WW1, 1914-1918, World war one images. German field guns captured at the Battle of Loos are displayed in London. Referred to at the time as 'The Big Push', the Battle of Loos marked the first major example of trench warfare. It was also the first time the British used poison gas. Display of captured German weapons and artillary at Horse Guards Parade, London 3rd November 1915. Major General Sir Francis Lloyd discussing one of the guns