The Library of Congress title for this drawing is likely in error – “The Confederates under Stuart crossing the Potomac at McCoy’s Ferry to destroy the Baltimore & Ohio Canal.” This was another J.E.B. Stuart’s audacious circumnavigations of the Army of the Potomac.
The confederates are fording the river in the background and passing under the canal through a “road culvert.” The drawing, by Theodore R. Davis, was done about the same time as another drawing of his showing “The Rebels Destroying the Baltimore and Ohio Railroad, as Seen from Fair View,” published in Harpers Weekly, November 8, 1862.
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Library of Congress image.