Civil War era moitor type warships.

Civil War era moitor type warships.

Civil War era moitor type warships. Labeling on photo is confused - both U.S. and Confederate navies are possible. Both are flying U.S. flag. More precisely, they appear to be two examples of federal CASCO class monitors, which proved to be unstabe, had turrets removed, and were used for in-shore and river torpedo (mines) removal.