Claim: Benjamin Henry Grierson was a music teacher, band teacher, and mercantile businessman before joining the Union Army, where he led the eponymous Grierson's Raid.
Evidence: Grierson was a music teacher, band leader, and mercantile businessman in Jacksonville, Illinois, from 1850 until 1861, when he joined the Union Army after the outbreak of the Civil War. During the war, Grierson led the eponymous Grierson's Raid, a mission which cut Confederate supply lines and diverted Confederate forces during the Vicksburg Campaign.