"Col Jackson realized that Harper's Ferry held not only important arms production factories, but was a choke-hold on the Baltimore and Ohio Railroad, the Chesapeake and Ohio Canal, and key telegraph trunk lines connecting Baltimore, Maryland and Washington, D.C. to the Ohio Valley and interior of the United States.As the war approached, the president of the B&O Railroad, John W. Garrett, who was sympathetic to the Union, became "outspoken" against the Confederacy, using "some strong adjectives to lend stress" to the word "rebel".