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The Pottawatomie massacre occurred on the night of May 24–25, 1856, in the Kansas Territory, United States. In reaction to the sacking of Lawrence by pro-slavery forces on May 21, and the telegraphed news of the severe attack on Massachusetts Senator Charles Sumner, John Brown and a band of abolitionist settlers—some of them members of the Pottawatomie Rifles—responded violently. Just north of Pottawatomie Creek, in Franklin County, they killed five pro-slavery settlers in front of their families.
This soon became the most famous of the many violent episodes of the "Bleeding Kansas" period, during which a state-level civil war in the Kansas Territory was described as a "tragic prelude" to the American Civil War which soon followed. "Bleeding Kansas" involved conflicts between pro- and anti-slavery settlers over whether the Kansas Territory would enter the Union as a slave state or a free state. It is also John Brown's most questionable act, both to his friends and his enemies. In the words of abolitionist Frederick Douglass, it was "a terrible remedy for a terrible malady.": 371