878343 Gun and Mortar Boats on the Mississippi, c.1878 (engraving) by American School, (19th century); 19 x11 cm; Free Library of Philadelphia; (add.info.: Engaging the Forts and Batteries on the Island & Mainland. Image shows a flotilla of gun boats in an unidentified battle on the river. On the right bank a row of mortar boats are firing furiously into the distance. Published in New York in 1878 in Battles of America By Sea and Land, with Biographies of Naval and Military Commanders. Volume III The Great Civil War by John Laird Wilson.); 穢 Free Library of Philadelphia ; Print and Picture Collection, Free Library of Philadelphia; American, out of copyright.