Alexander McDowell McCook - Civil War

Civil War

At the start of the Civil War, McCook was appointed colonel of the 1st Ohio Infantry in April 1861. He served in the Washington defenses and saw action at the First Battle of Bull Run. On September 3, 1861, he was promoted to brigadier general of volunteers and commanded a division in Tennessee. He earned the brevet of lieutenant colonel in the regular army for his part in the capture of Nashville, Tennessee. McCook then commanded the 2nd Division in the Army of the Ohio at the Battle of Shiloh on the second day of fighting, and then in the subsequent campaign against Corinth. He was promoted to major general of volunteers on July 17, 1862.

McCook was given command of the I Corps in the Army of the Ohio. His corps suffered heavy casualties and driven back a mile at the Battle of Perryville in October 1862. Command of the Army of the Ohio was reorganized and his command designated the Right Wing of the XIV Corps in the new Army of the Cumberland. His command again suffered heavy losses at the Battle of Stones River. Once again the command structure was reorganized and his corps named the XX Corps. For the third and final time, at Chickamauga, McCook's troops suffered heavily and were driven from the field. He was courtmartialed and partially blamed for the Union disaster at Chickamauga. He was not convicted but relieved of duty in the Army of the Cumberland.

He waited almost a year before receiving another command assignment of any kind. It came thanks in part to Confederate General Jubal Early and his threat against Washington, D.C. McCook was placed in command of the "Defenses of the Potomac River and Washington" and was in charge of all forces defending the capital at the Battle of Fort Stevens. The day the battle ended, so did McCook's command of the city's defenses and he was again without command. At the close of the war he was given command of the District of Eastern Arkansas. He received brevet promotions to brigadier general and major general in the regular army for service throughout the war.