Benjamin H. Grierson

Benjamin Henry Grierson (July 8, 1826 – August 31, 1911) was a music teacher, then a career officer in the United States Army. He was a cavalry general in the volunteer Union Army during the Civil War and later led troops in the American Old West.
He is most noted for Grierson's Raid, an 1863 expedition through Confederate-held territory that severed enemy communication lines between Vicksburg, Mississippi and Confederate commanders in the Eastern Theater. After the war he organized and led the Buffalo Soldiers of the 10th Cavalry Regiment from 1866 to 1890.
https://en.wikipedia.org/wiki/Benjamin_Grierson