Preparations
To attain financial backing and political support for the raid on Harpers Ferry, Brown spent most of 1857 meeting with abolitionists in Massachusetts, New York, and Connecticut. Initially Brown returned to Springfield, where he received contributions, and also a letter of recommendation from a prominent and wealthy merchant, George Walker. Walker was the brother-in-law of Franklin Benjamin Sanborn, the secretary for the Massachusetts State Kansas Committee, who introduced Brown to several influential abolitionists in the Boston area in January 1857.
Amos Adams Lawrence, a prominent Boston merchant, secretly gave Brown a large amount of cash. William Lloyd Garrison, Thomas Wentworth Higginson, Theodore Parker and George Luther Stearns, and Samuel Gridley Howe also supported Brown, although Garrison, a pacifist, disagreed about the need to use violence to end slavery.
Most of the money for the raid came from the "Secret Six", Franklin B. Sanborn, Samuel G. Howe M.D., businessman George L. Stearns, real estate tycoon Gerrit Smith, transcendentalist and reforming minister of the Unitarian church Theodore Parker, and Unitarian minister Thomas Wentworth Higginson. Recent research has also highlighted the substantial contribution of Mary Ellen Pleasant, an African American entrepreneur and abolitionist, who donated $30,000 (equivalent to $1,036,607 in 2025) toward the cause.
In Boston, he met Henry David Thoreau and Ralph Waldo Emerson. Even with the Secret Six and other contributors, Brown had not collected all money needed to fund the raid. He wrote an appeal, Old Browns Farewell, to abolitionists in the east with some success.
In December 1857, an anti-slavery Mock Legislature, organized by Brown, met in Springdale, Iowa. On several of Brown's trips across Iowa he preached at Hitchcock House, an Underground Railroad stop in Lewis, Iowa.
With a free-state victory in the October elections, Kansas was quiet. Brown made his men return to Iowa, where he told them tidbits of his Virginia scheme. In January 1858, Brown left his men in Springdale, Iowa, and set off to visit Frederick Douglass in Rochester, New York. There he discussed his plans with Douglass, and reconsidered Forbes' criticisms. Brown wrote a Provisional Constitution that would create a government for a new state in the region of his invasion. He then traveled to Peterboro, New York, and Boston to discuss matters with the Secret Six. In letters to them, he indicated that, along with recruits, he would go into the South equipped with weapons to do "Kansas work". While in Boston making secret preparations for his operation on Harper's Ferry, he was raising money for weapons that were manufactured in Connecticut. Abolitionist Chaplain Photius Fisk gave him a sizable donation and obtained his autograph which he later gave to the Kansas Historical Society.
Brown started to wear a beard, "to change his usual appearance".
The Massachusetts Committee pledged to provide 200 Sharps Rifles and ammunition, which were being stored at Tabor, Iowa. The rifles were originally intended for use by free-staters in Kansas. After negotiation between the officers of the Massachusetts Kansas Committee and the National Committee, the rifles were transferred to the Massachusetts Committee for use in the Harpers Ferry raid. Horatio N. Rust, a friend of Brown's, helped acquire for 1,000 pikes for the intended slave rebellion.
Weapons were purchased and sent to Kennedy Farmhouse in Sharpsburg, Maryland, where they were stored. Brown's plan was to make use of weapons, ammunition, and other military equipment stored at the armory, arsenal, and the rifle factory in Harpers Ferry. There were an estimated 100,000 muskets and rifles at the armory and arsenal complex at the time.
The more sophisticated weapons, like Sharps rifles and pistols, were to be used by Black and White officers. The remaining fighters would use spear-like pikes, shotguns, and muskets.
Brown and 12 of his followers, including his son Owen, traveled to Chatham, Ontario, where he convened on May 10 a Constitutional Convention. The convention, with several dozen delegates including his friend James Madison Bell, was put together with the help of Dr. Martin Delany. One-third of Chatham's 6,000 residents were fugitive slaves, and it was here that Brown was introduced to Harriet Tubman, who helped him recruit. The convention's 34 blacks and 12 whites adopted Brown's Provisional Constitution. Brown had long used the terminology of the Subterranean Pass Way from the late 1840s, so it is possible that Delany conflated Brown's statements over the years. Regardless, Brown was elected commander-in-chief and named John Henrie Kagi his "Secretary of War". Richard Realf was named "Secretary of State". Elder Monroe, a black minister, was to act as president until another was chosen. A. M. Chapman was the acting vice president; Delany, the corresponding secretary. In 1859, "A Declaration of Liberty by the Representatives of the Slave Population of the United States of America" was written.
While in New York City, Brown was introduced to Hugh Forbes, an English mercenary, who had experience as a military tactician fighting with Giuseppe Garibaldi. Concerned about Brown's strategy, Forbes undermined and delayed the plans for the raid.
Although nearly all of the delegates signed the constitution, few volunteered to join Brown's forces, although it will never be clear how many Canadian expatriates actually intended to join Brown because of a subsequent "security leak" that threw off plans for the raid, creating a hiatus in which Brown lost contact with many of the Canadian leaders. This crisis occurred when Hugh Forbes, Brown's mercenary, tried to expose the plans to Massachusetts Senator Henry Wilson and others. The Secret Six feared their names would be made public. Howe and Higginson wanted no delays in Brown's progress, while Parker, Stearns, Smith and Sanborn insisted on postponement. Stearns and Smith were the major sources of funds, and their words carried more weight. To throw Forbes off the trail and invalidate his assertions, Brown returned to Kansas in June, and remained in that vicinity for six months. There he joined forces with James Montgomery, who was leading raids into Missouri.
On December 20, Brown led his own raid, in which he liberated 11 slaves, took captive two white men, and looted horses and wagons. The Governor of Missouri announced a reward of $3,000 (equivalent to $107,500 in 2025) for his capture. On January 20, 1859, he embarked on a lengthy journey to take the liberated slaves to Detroit and then on a ferry to Canada. While passing through Chicago, Brown met with abolitionists Allan Pinkerton, John Jones, and Henry O. Wagoner who arranged and raised the fare for the passage to Detroit and purchased supplies for Brown. Jones's wife and fellow abolitionist, Mary Jane Richardson Jones, provided new clothes for Brown and his men, including the garb Brown was hanged in six months later. On March 12, 1859, Brown met with Frederick Douglass and Detroit abolitionists George DeBaptiste, William Lambert, and others at William Webb's house in Detroit to discuss emancipation. DeBaptiste proposed that conspirators blow up some of the South's largest churches. The suggestion was opposed by Brown, who felt humanity precluded such unnecessary bloodshed.
Over the course of the next few months, he traveled again through Ohio, New York, Connecticut, and Massachusetts to drum up more support for the cause. On May 9, he delivered a lecture in Concord, Massachusetts, that Amos Bronson Alcott, Emerson, and Thoreau attended. Brown reconnoitered with the Secret Six.
As he began recruiting supporters for an attack on slaveholders, Brown was joined by Harriet Tubman, "General Tubman", as he called her. Her knowledge of support networks and resources in the border states of Pennsylvania, Maryland, and Delaware was invaluable to Brown and his planners. She also raised funds for Brown.
Some abolitionists, including Frederick Douglass and William Lloyd Garrison, opposed his tactics, but Brown dreamed of fighting to create a new state for freed slaves and made preparations for military action. After he began the first battle, he believed, slaves would rise up and carry out a rebellion across the South.