John A. McClernand was a career politician, and those ambitions and qualities continued during his Civil War service. A member of the Illinois General Assembly and a U.S. Representative for 10 years, McClernard was connected to other prominent figures of the time such as Abraham Lincoln and Stephen Douglas. However, he is best known for his rivalry with Gen. Ulysses S. Grant, and this biography balances McClernard's political career with his military leadership and his place in the Union command structure.