The Lawrence Massacre of 1863 — also called Quantrill's Raid — is the defining event in the city's history, and its memory runs through the town like a fault line. The attack was ideologically motivated: Lawrence was the most prominent Free State town in Kansas, a centre of abolitionist sentiment and a known safe haven for Jayhawker militias who had been raiding into Missouri.
Today a small monument on Vermont Street marks the approximate location of the worst fighting. The Watkins Museum of History (1047 Massachusetts Street) covers the massacre in detail, with documents, artefacts, and accounts from survivors. The Eldridge Hotel at 7th and Massachusetts was burned to the ground that morning — the current building is a later replacement built on the same spot.