The Iron Brigade was an infantry brigade in the Union Army during the American Civil War, consisting primarily of Western regiments, that was noted for its ability to withstand almost any fire, and its regiments combined took the highest casualty percentage of the war.
The all-Western brigade earned its famous nickname while under the command of Brigadier General John Gibbon, who led the brigade in its first fight at Brawner's Farm during the Second Battle of Bull Run, where it stood up against Thomas J. "Stonewall" Jackson’s forces. The designation "Iron Brigade" originated at the battle for the gaps of South Mountain, the prelude to the Battle of Antietam. Maj. Gen. Joseph Hooker, commanding I Corps, approached Army of the Potomac commander Maj. Gen. George B. McClellan, seeking orders. McClellan asked, "What troops are those fighting in the Pike?" Hooker replied, "* General Gibbon's brigade of Western men." McClellan stated, "They must be made of iron." Hooker said that the regiment had performed even more superbly at Second Bull Run; to this, McClellan said that the brigade consisted of the "best troops in the world." Hooker became very elated and rode off with his orders; afterward, the name "Iron Brigade" stuck.
The Iron Brigade lost its unofficial designation on July 16, 1863, following its crippling losses at Gettysburg, when a non-Western regiment (the 167th Pennsylvania) was incorporated into it. However, the brigade that succeeded it, which included the survivors of the Iron Brigade, was commanded by:
In June of 1865, the units of the surviving brigade were separated and reassigned to the Army of the Tennessee.
The brigade fought in the Second Bull Run, Antietam, Fredericksburg, Chancellorsville, Gettysburg, Mine Run, Overland, Richmond-Petersburg, and Appomattox campaigns.
The brigade took pride in its designation, "1st Brigade, 1st Division, I Corps", under which it played a prominent role in the first day of the Battle of Gettysburg, July 1, 1863. It repulsed the first Confederate offensive through Herbst’s Woods, capturing much of Brig. Gen. James J. Archer's Confederate brigade, and Archer himself. It suffered tremendous losses in the second, larger Confederate assault that afternoon.
The Iron Brigade, proportionately, suffered the most casualties of any brigade in the Civil War. For example, 61% (1,153 out of 1,885) were casualties at Gettysburg. Similarly, the 2nd Wisconsin, which suffered 77% casualties at Gettysburg, suffered the most throughout the war; it was second only to the 24th Michigan (also an Iron Brigade regiment) in total casualties at Gettysburg. The latter regiment lost 397 out of 496 soldiers, an 80% casualty rate.
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"Iron Brigade".
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