The Boston Massacre (The Bloody Massacre). Dated: 1770. Dimensions: image: 20 ? 21.91 cm (7 7/8 ? 8 5/8 in.) sheet: 27.31 ? 23.81 cm (10 3/4 ? 9 3/8 in.). Medium: hand-colored engraving. Museum: National Gallery of Art, Washington DC. Author: after H