Don Carlos Buell
Soon after the fall of Fort Sumter, he was promoted to captain of the 8th U.S. Infantry, and by October 29, 1861, he was Colonel of the 41st Ohio Infantry. Starting in January 1862, he commanded a brigade in the Army of the Ohio, under Maj. Gen. Don Carlos Buell. His first major battle was Shiloh, where Buell's army arrived on the second day (April 7, 1862), in time to counterattack the Confederate army for a Union victory.