2-710-808 - The Print Collector/Heritage Images

'On the Trail of the Submarine', (1919). Scene from the First World War, 1914-1919: 'With the advent of American troops in France, Germany concentrated her U boats on the transport ships carrying American troops overseas. The means adopted to protect them were many and varied. The observation balloon on board a U.S. battleship was one that was highly successful.' From "The History of the Great European War: its causes and effects", Vol. VII, by W. Stanley Macbean Knight. [Caxton Pulishing Company, Limited, London, 1919]