Maj. Jed. Hotchkiss, Confederate Military History, a library of Confederate States Military History: Volume 3, Virginia
Clement Anselm Evans, Ed.

[27] 11 a. m., of the 17th, the Jefferson Guards, from Charlestown, arrived, soon followed by the Hamtramck and the Shepherdstown troop, from Shepherdstown, and Alburtis' company from Martinsburg. These, under the command of Col. R. A. Baylor, forced the insurgents within the armory enclosure, which they surrounded by a cordon of pickets. Brown then withdrew his men into the gate house, which he proceeded to loophole and fortify, taking with him ten of the most prominent of his Virginia and Maryland captives, which he termed ‘hostages,’ to insure the safety of his band. From openings in the building the insurgents fired upon all white people that came in sight.

After sunset of the 17th, Capt. B. B. Washington's company from Winchester, and three companies from Frederick City, Md., under Colonel Shriver, arrived; later came companies from Baltimore, under Gen. C. C. Edgerton, and a detachment of United States marines, commanded by Lieut. J. Green and Major Russell, accompanied by Lieut.-Col. R. E. Lee, of the Second United States cavalry (with his aide, Lieut. J. E. B. Stuart, of the First United States cavalry), who, happening to be at Arlington, his home, near Washington, had been ordered to take command at Harper's Ferry, recapture the government armory and arsenal, and restore order. Colonel Lee halted the Baltimore troops at Sandy Hook, about a mile and a half east of Harper's Ferry, directed the United States artillery companies (ordered from Fort Monroe) to halt in Baltimore, then crossed to Harper's Ferry with the marines, disposed them in the armory grounds so as to prevent the escape of the insurgents, and awaited dawn of the 18th before attacking Brown's stronghold, for fear of sacrificing the lives of the ‘hostages’ in a midnight attack.

Soon after daylight of the 18th, after having posted the volunteer troops so as to completely invest the armory grounds, and prepared for an assault upon Brown's fort by the marines, Lee, under a flag by Lieutenant Stuart, made a written demand upon Brown to surrender himself, his associates and the prisoners they had taken, with the assurance that ‘if they will peaceably surrender themselves and restore the pillaged property, they shall be kept in safety to await orders of the President. . . . That if he is compelled to take them by force he cannot ’