Library of Congress
Sized, cropped, and adjusted for use here by John Osborne, Dickinson College, February 11, 2013.
Library of Congress Prints and Photographs Division
Morgan Collection of Civil War Drawings, Prints and Photograph Division, Library of Congress
Artist: Alfred Rudolph Waud
Finished woodcut published in Harper's Weekly Magazine, May 23, 1863
Cropped from the larger image, also available here.