With the outbreak of the American Civil War, the northwestern state of Wisconsin raised 91,379 soldiers for the Union Army, 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, although several regiments served in Eastern armies, including three regiments within the famed Iron Brigade. 3,794 were killed in action or mortally wounded, 8,022 died of disease, and 400 were killed in accidents. The total mortality was 12,216 men, about 13.4 percent of total enlistments.