Brown and the free settlers were optimistic that they could bring Kansas into the union as a slavery-free state. After the winter snows thawed in 1856, the pro-slavery activists began a campaign to seize Kansas on their own terms. Brown was particularly affected by the sacking of Lawrence in May 1856, in which a sheriff-led posse destroyed newspaper offices and a hotel. Only one man, a Border Ruffian, was killed. Preston Brooks's caning of anti-slavery Senator Charles Sumner in the United States Senate also fueled Brown's anger. A pro-slavery writer, Benjamin Franklin Stringfellow, of the Squatter Sovereign, wrote that "[pro-slavery forces] are determined to repel this Northern invasion, and make Kansas a Slave State; though our rivers should be covered with the blood of their victims, and the carcasses of the Abolitionists should be so numerous in the territory as to breed disease and sickness, we will not be deterred from our purpose". Brown was outraged by both the violence of the pro-slavery forces, and what he saw as a weak and cowardly response by the antislavery partisans and the Free State settlers, whom he described as "cowards, or worse".
https://en.wikipedia.org/wiki/John_Brown_(abolitionist)#Pottawatomie
John Brown's raid on Harper's Ferry was an effort by armed abolitionist John Brown to initiate an armed slave revolt in 1859 by taking over a United States arsenal at Harpers Ferry, Virginia. Brown's party of 22 was defeated by a company of U.S. Marines, led by First Lieutenant Israel Greene. Colonel Robert E. Lee was in overall command of the operation to retake the arsenal. John Brown had originally asked Harriet Tubman and Frederick Douglass, both of whom he had met in his transformative years as an abolitionist in Springfield, Massachusetts, to join him in his raid, but Tubman was prevented by illness, and Douglass declined, as he believed Brown's plan would fail.
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