The 21st Regiment Wisconsin Volunteer Infantry was an infantry

Infantry

Infantrymen are soldiers who are specifically trained for the role of fighting on foot to engage the enemy face to face and have historically borne the brunt of the casualties of combat in wars. As the oldest branch of combat arms, they are the backbone of armies...

 regiment

Regiment

A regiment is a major tactical military unit, composed of variable numbers of batteries, squadrons or battalions, commanded by a colonel or lieutenant colonel...

 that served in the Union Army

Union Army

The Union Army was the land force that fought for the Union during the American Civil War. It was also known as the Federal Army, the U.S. Army, the Northern Army and the National Army...

 during the American Civil War

American Civil War

The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

.

Service

The 21st Wisconsin was organized at Oshkosh, Wisconsin

Oshkosh, Wisconsin

As of the census of 2000, there were 62,916 people, 24,082 households, and 13,654 families residing in the city. The population density was 2,662.2 people per square mile . There were 25,420 housing units at an average density of 1,075.6 per square mile...

and mustered into Federal service September 5, 1862.

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.http://www.civilwararchive.com/Unreghst/unwiinf1.htm#21st