William Clarke Quantrill (July 31, 1837 – June 6, 1865) was a Confederate guerrilla leader during the American Civil War. After leading a Confederate bushwhacker unit along the Missouri-Kansas border in the early 1860s, which included the notorious raid on Lawrence, Kansas ("Quantrill's Raid") in 1863, he eventually ended up in Kentucky, where he was mortally wounded in a Union ambush in May 1865 at the age of 27.