Auguste Raffet, ‘Les Arabes signalent l'approche de l'armée française’, 1837, National Gallery of Art, Washington, D.C.
image: 15 x 27.3 cm (5 7/8 x 10 3/4 in.)  sheet: 32.6 x 37.8 cm (12 13/16 x 14 7/8 in.)