Sorry it's taken me so long to get back to you. Your suggestions were very good and led me to the Maine Historical Society and the Maine Maritime Museum, as well as the Mystic Seaport. I still haven't found what I'm looking for, but it looks as if I'm on the right track, anyway. There was a Sam'l A. Appleton that was a blockader in the South, which makes me think I'm on the right track. I believe my great-grandfather was a blockader at Vicksburg. Thank you again.