The 18th Indiana Volunteer Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War. Service The 18th Indiana Volunteer Infantry was organized at Indianapolis, Indiana, on August 16, 1861. Battle of Pea Ridge Battle of Port Gibson Battle of Champion Hill Battle of Big Black River Siege of Vicksburg Battle of Cedar Creek The regiment mustered out of service on August 28, 1865. Total strength and casualties The regiment lost 5 officers and 68 enlisted men killed in action or died of wounds and 1 officers and 130 enlisted men who died of disease, for a total of 204 fatalities. Commanders Colonel Thomas Pattison Colonel Henry Dana Washburn See also List of Indiana Civil War regiments Indiana in the Civil War Notes References The Civil War Archive - Indiana Units Civil War - Indiana Units and formations of the Union Army from Indiana 1861 establishments in Indiana Military units and formations established in 1861 Military units and formations disestablished in 1865