Wisconsin in the American Civil War, being a northern state, fought for the Union. When the Civil War started, Wisconsin raised 91,379 soldiers for the Union Army. They were organized into 53 infantry regiments, 4 cavalry regiments, a company of Berdan's sharpshooters, 13 light artillery batteries and 1 unit of heavy artillery. Most of the Wisconsin troops served in the Western Theater. However, several regiments served in Eastern armies, including three regiments within the famed Iron Brigade. A total of 3,794 were killed in action or mortally wounded. Another 8,022 died of disease. About 400 were killed in accidents. The total casualties were 12,216 men. This was about 13.4 percent of total Wisconsin enlistments.