 Gibbon attempted to have Sully court-martialed for dereliction of duty, although a court of inquiry found him innocent of these charges, he was removed from command of his brigade and exiled to the Great Plains, never to serve in the Civil War again.After being relieved of command, Sully went west and gained notoriety for committing several massacres against natives.On September 3, 1863, at Whitestone Hill, Dakota Territory, as reprisal for the Dakota Conflict of 1862, his troops destroyed a village of some 500 tipis that lodged Yankton, Dakota, Hunkpapa and Sihasapa Lakota.