O.H. Willard's Galleries, ‘Light Artillery, Sergeant’, ca. 1864, National Gallery of Art, Washington, D.C.
image: 20.4 x 14.7 cm (8 1/16 x 5 13/16 in.)  mount: 33.7 x 25.8 cm (13 1/4 x 10 3/16 in.)