The Iron Brigade, also known as The Black Hats, Black Hat Brigade, Iron Brigade of the West, and originally King's Wisconsin Brigade was an infantry brigade in the Union Army of the Potomac during the American Civil War. Although it fought entirely in the Eastern Theater, it was composed of regiments from three Western states that are now within the region of the Midwest. Noted for its excellent discipline, ferocity in battle, and extraordinarily strong morale, the Iron Brigade suffered 1,131 men killed out of 7,257 total enlistments: the highest percentage of loss suffered by any brigade in the United States Army during the war.
Iron Brigade unit badge, a maltese cross design, showing the Wisconsin, Michigan, and Indiana, Union Army regiments, who were the core of the Brigade, on a historical marker, at Gettysburg National Military Park.
Soldiers in the 7th Wisconsin Volunteer Infantry Regiment, Company I, of the Iron Brigade, in Virginia, 1862
Rufus King, the founder and original commander of the Wisconsin Iron Brigade
John Gibbon, the commander of the combined three-state Western Iron Brigade
The Army of the Potomac was the primary field army of the Union Army in the Eastern Theater of the American Civil War. It was created in July 1861 shortly after the First Battle of Bull Run and was disbanded in June 1865 following the surrender of the Confederate Army of Northern Virginia in April.
Generals of the Army of the Potomac at Culpeper, Virginia in September 1863, including (from left to right): Gouverneur K. Warren, William H. French, George G. Meade, Henry J. Hunt, Andrew A. Humphreys, and George Sykes
The Army of the Potomac – Our Outlying Picket in the Woods, an illustration of the Army of the Potomac by Winslow Homer published in Harper's Weekly on June 7, 1862
Grand Review of the Army of the Potomac, an October 1863 illustration by Thomas Nast in Harper's Weekly
An illustration of the Army of the Potomac celebrating Saint Patrick's Day with a steeplechase race among the Irish Brigade, drawn by Edwin Forbes on March 17, 1863