This poster was probably part of the U.S. government’s Fourth Liberty Loan campaign during World War I, which ran from September 28 to October 19, 1918. As in many of American propaganda posters of the era, the soldier, here seen manning a mounted machine gun, makes a direct appeal to the viewer, hand outstretched as he appears to request more “Ammunition!” Vincent Lynch was a painter and commercial illustrator whose work had been published in such periodicals as American Magazine and Scientific American. This appears to be one of very few posters he designed in support of the war effort. The poster was printed to a very high standard by Ketterlinus Lithographic Manufacturing Co. of Philadelphia, one of the city’s earliest lithographic firms, established in 1842. This large commercial operation used the most up-to-date methods for printing posters, labels, and other promotional materials.