'Machine Gun Mounted On Wheel So That Gunner May Easily Swing Round and Follow Enemy Aeroplanes', (1919). British soldiers with anti-aircraft gun mounted on an ingenious piece of makeshift equipment, scene from the First World War, 1914-1919. From "The History of the Great European War: its causes and effects", Vol. IX, by W. Stanley Macbean Knight. [Caxton Pulishing Company, Limited, London, 1919]