21st Wisconsin Volunteer Infantry Regiment

The 21st Regiment Wisconsin Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.

Service
The 21st Wisconsin was organized at Oshkosh, Wisconsin and mustered into Federal service September 5, 1862.

On September 9, 1864, Col. Francis H. West, commanding the Thirty-first Wisconsin Infantry., details the regiments transferred to the XX Corp. during the siege of Atlanta in his official report:

Regiment arrived at Nashville June 10, and was assigned to post command, to perform city provost-guard duty. On July 16, orders having been received from Major-General Thomas, commanding Department of the Cumberland, transferring the regiment from the Fourth Division, Twentieth Corps, to the Third Brigade, First Division, Twentieth Corps, and ordering the regiment to proceed at once to the front, the regiment proceeded via Chattanooga to Marietta, Ga., by rail, from which place it marched to the army at the front on the south side of the Chattahoochee River, where it arrived and reported to Colonel Robinson, commanding brigade, on the morning of July 21, 1864. On this march the regiment lost by railroad accident, when near Adairsville, Ga., 1 killed and 12 wounded, including 2 commissioned officers. The effective force of the regiment at this date was 650; aggregate, 872.

The regiment was mustered out on June 17, 1865.

Casualties
The 21st Wisconsin suffered 5 officers and 117 enlisted men killed in action or who later died of their wounds, plus another 3 officers and 180 enlisted men who died of disease, for a total of 305 fatalities.

Commanders

 * Colonel Benjamin Sweet
 * Colonel Harrison C. Hobart