Who said It is time to strike fire with fire and strike terror in the hearts of the pro-slavery people?

John Brown, an Abolitionist said this in response to an attack on Lawrence, Kansas in 1856. A pro-slavery group had come there to arrest the free-soil government (anti-slavery) leaders for what they considered treason. The leaders had already fled, so they burned down buildings and destroyed what they could in connection to the free-soil government. One person was killed during this attack. Brown became outraged by this and led a retaliation against slavery supporters which became known as the Pottawatomie Massacre. These incidents ultimately led the state into civil war.