Library of congress description:
inscribed above image: infernal machines discovered in the potomac [near aquia] creek by the flotilla for whose destruction they were intended. Sketched by a. Waud from a photograph by james f. Gibson. Inscribed right with arrow leading to a frigate: pawnee. Inscribed vertically left margin: gunboat freeborn / capt ward. Date: 7 July 1861.
