"Harper, Henry Holcombe, Maj, 14th SCVI, capt. at Deep Bottom, VA, 7/28/64, and sent to Old Capitol Prison, Washington, DC. Moved to Ft. Delaware, DE, 8/4/64; Released 7/24/65."
Kirkland, Randolph W., Jr., BROKEN FORTUNES: SOUTH CAROLINA SOLDIERS, SAILORS, AND CITIZENS HELD IN U.S. PRISONS, 1861-1865, (Charleston, SC: 2002), p. 201.

Looks like Krick was in error on the prison(s), too:-)