Mathew Brady or Associate (attrib.)  Confederate Earthworks. Fredericksburg Virginia. 1864.   The picture appears in William C. Davis.   The Image Of War, Vol. III,  "The Embattled Confederacy."  pp. 91.   

6 1/2 x 8 inch Albumen print  on a mount  with some surface marks.   "Knoxville.  Handy-699. Duplicate" is written in pencil on the back.  This picture  comes through Levin Handy, Brady's nephew.  A very interesting Civil War image.  The Metropolitan Museum of Art (Accession Number: 33.65.186) credits this photograph to Timothy O'Sullivan with the note "Formerly attributed to Mathew B. Brady"