b. 1827, in Monroe County, New York; d. June 27, 1864, in Kennesaw Mountain, Georgia. Harmon moved to Danville, Illinois in 1853 and began practicing law with Oliver L. Davis, with whom he worked for many years. In 1857 he was elected to the state legislature. At the beginning of the Civil War, Harmon entered the army as a colonel of the One Hundred Twenty-Fifth Illinois Infantry, which was composed mostly of Vermilion County men.