In April 1861, Herron was appointed captain of Company I, 1st Iowa Volunteer Regiment. He served with Nathaniel Lyon's forces in Missouri, participating in the battles of Boonville and Wilson's Creek. In August, Herron was promoted to lieutenant colonel of the 9th Iowa Volunteer Regiment and fought in the battle of Pea Ridge, where he was wounded and taken prisoner, but exchanged shortly afterwards. He received a promotion to brigadier general of volunteers for his actions in this battle, and later received the Medal of Honor. He commanded both the 2nd and 3rd Divisions of the Army of the Frontier and made a forced march of 114 miles (183 km) in three days to join James G.
Blunt's division in western Arkansas. Herron's and Blunt's combined command engaged Thomas C. Hindman in the battle of Prairie Grove and forced the Confederates to abandon western Arkansas. For his actions at Prairie Grove, Herron was appointed major general of volunteers, becoming the youngest major general on either side at the time of his promotion.His two divisions were consolidated to form "Herron's Division" which was attached to the XVII Corps. During the Siege of Vicksburg, Herron's division was placed on the extreme left flank of the Union lines.
Upon the surrender of the city Ulysses S. Grant chose Herron, along with generals James B. Logan, to lead the procession into the city and accept the formal surrender of arms on July 4, 1863. He next led the Yazoo City expedition, capturing the city, a Confederate fleet and supplies there. Herron was appointed to command of the XIII Corps and occupied the Texas coast with headquarters at Brownsville.During this time, he provided aid to Mexican President Benito Juárez and prevented French troops of Emperor Maximilian from establishing themselves along the Rio Grande. As the Civil War came to an end, Herron commanded the District of Northern Louisiana. After the Civil War, he stayed in Baton Rouge. He was the Secretary of State of Louisiana before moving to New York City in 1877, where he practiced law and served as a banker. He was married to Adelaide Wilbray.
A widower since 1901, he died of a six-week illness,  reportedly a pauper in a tenement in New York City,  and was buried in Calvary Cemetery in Queens, New York. He was a member of the Grand Army of the Republic and the Military Order of the Loyal Legion,  The commonly accepted story that Herron died in poverty is likely false, as the "tenement" in which he lived at the time of his death was in a fashionable neighborhood and well-appointed. A bronze bust of Herron (sculpted by Solon Borglum) was erected in January 1914. It stands on Pemberton Avenue in Vicksburg National Military Park.
Rank and organization: Lieutenant Colonel, 9th Iowa Infantry. Place and date: At Pea Ridge, Ark. Entered service at: Pittsburgh, Pa. Born: February 17, 1837, Pittsburgh, Pa.
Date of issue September 26, 1893. Was foremost in leading his men, rallying them to repeated acts of daring, until himself disabled and taken prisoner. The item "Civil War CDV Union General Francis Herron Medal of Honor" is in sale since Monday, June 28, 2021.
This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Photographs". The seller is "civil_war_photos" and is located in Midland, Michigan. This item can be shipped worldwide.