There is a picture on page 700 of the Oct. 29, 1864 issue of Harper's Weekly with the caption:

The Rebel Gun-boat " Morgan."

THE "METACOMET'S" BOATS BLOWING UP THE REBEL RAM "NASHVILLE," AUGUST 16, 1864

http://www.sonofthesouth.net/leefoundation/civil-war/1864/october/fleet-mobile-bay.htm

This could not be the Nashville of the Mobile Squadron, since it operated until the end of the war. Was there another Nashville?