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As the Confederates were preparing, a Union army called the Army of Northeastern Virginia (not to be confused with Lee’s legendary Army of Northern Virginia) was being assembled under the command of 42 year old Irvin McDowell, who was promoted to brigadier general in the regular army on May 14, 1861, despite the fact he had never commanded soldiers in battle. McDowell got the spot as a result of politics, thanks to the influence of his friend and mentor Salmon Chase, Lincoln’s Treasury Secretary.
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Charles River Editors (The Stonewall Brigade: The History of the Most Famous Confederate Combat Unit of the Civil War)