|21st Regiment Wisconsin Volunteer Infantry|
|File:Flag of Wisconsin.svg|
|Active||September 5, 1862 to July 14, 1865|
|Engagements||Battle of Perryville|
Battle of Stone's River
Battle of Chickamauga
The 21st Wisconsin was organized at Oshkosh, Wisconsin and mustered into Federal service September 5, 1862.
The regiment was mustered out on June 17, 1865.
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.
- Colonel Benjamin Sweet
- List of Wisconsin Civil War Units
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