Soldiers at work on the dam, during the digging of the canal in late 1864. The original caption stated: The mist arising against the bank is caused by a rebel shell which exploded while this position was being taken, Dec. 1864 before the bank was blown up. Photograph was printed by (and possibly taken by) E. & H.T. Anthony and Company, 501 Broadway, New York. Naval History and Heritage Command Photograph.