At the start of the Civil War, McDowell was serving on the staff of Lieutenant General Winfield, the Army’s commanding general. Scott had reservations with McDowell’s abilities to lead troops in battle when he was chosen to lead Union forces against the Rebels in northern Virginia in the summer of 1861. (National Archives)

At the start of the Civil War, McDowell was serving on the staff of Lieutenant General Winfield, the Army’s commanding general. Scott had reservations with McDowell’s abilities to lead troops in battle when he was chosen to lead Union forces against the Rebels in northern Virginia in the summer of 1861. (National Archives)