| Quantrill's Raiders | |
|---|---|
 William Clarke Quantrill's flag | |
| Active | 1861 – May 1865 |
| Allegiance | .svg){kind=small} Confederate States |
| Branch | Partisan Rangers |
| Type | Partisan |
| Role | Direct action Guerrilla warfare Raiding Reconnaissance Skirmisher |
| Size | ~400 (1863) |
| Engagements | American Civil War |
| Commanders | |
| Notable commanders | Captain William Quantrill |
Quantrill's Raiders were the best-known of the pro-Confederate partisan guerrillas (also known as "bushwhackers") who fought in the American Civil War. Their leader was William Quantrill and they included Jesse James and his brother Frank.
Early in the war Missouri and Kansas were nominally under Union government control and became subject to widespread violence as groups of Confederate bushwhackers and anti-slavery Jayhawkers competed for control. The town of Lawrence, Kansas, was a center of anti-slavery sentiment. In August 1863, Quantrill led an attack on the town, killing more than 180 civilians.
The Confederate government, which had granted Quantrill a field commission under the Partisan Ranger Act, was outraged and withdrew support for such irregular forces. By 1864 Quantrill had lost control of the group, which split up into small bands. Some, including Quantrill, were killed in various engagements. Others lived on to hold reunions many years later, when the name Quantrill's Raiders began to be used. The James brothers formed their own gang and conducted robberies for years as a continuing insurgency in the region.