XVI Corps ( Union Army ) The XVI Army Corps was a corps of the Union Army during the American Civil War . The corps rarely fought as one unified unit , as its divisions were often scattered across the country . History . Creation and Vicksburg . The XVI Corps was organized on December 18 , 1862 with Maj . Gen . Stephen A . Hurlbut in command . It had four divisions commanded respectively by William Sooy Smith ( 1st Division ) , Grenville Dodge ( 2nd Division ) , Nathan Kimball ( 3rd Division ) and Jacob G . Lauman ( 4th Division ) . These divisions were assigned to garrison duty in the vicinity of Memphis , LaGrange and Corinth . With the Army of the Tennessee besieging Vicksburg , Maj . Gen . Ulysses S . Grant gathered reinforcements from the surrounding areas . The divisions of Smith , Kimball and Lauman were ordered to Vicksburg on June 12 . This detachment was led by Maj . Gen . Cadwallader C . Washburn . Hurlbut and Dodge remained on garrison duty in Tennessee during this time . After the fall of Vicksburg , Smith ' s division was attached to the IX Corps and Lauman ' s division was attached to the XIII Corps during Maj . Gen . William T . Sherman ' s expedition to Jackson , Mississippi . In 1864 , the corps was divided into two wings of two divisions each . Left Wing . The Left Wing was led by Maj . Gen . Grenville Dodge and participated in Maj . Gen . William T . Sherman ' s Atlanta Campaign . The left wing was composed of the divisions of Brig . Gen . Thomas W . Sweeny ( 2nd Division ) and Brig . Gen . James C . Veatch ( 4th Division ) . These divisions fought notably at the Battle of Atlanta on July 22 , 1864 holding off Confederate General John Bell Hood ' s flank attack . At this battle Veatch ' s division was led by Brig . Gen . John W . Fuller . Right Wing . The remaining division which did not join Sherman ' s Atlanta Campaign were left to guard the Mississippi River valley . Kimball ' s , Lauman ' s and William Sooy Smith ' s divisions were permanently removed to other corps while James Tuttle ' s division of the XV Corps and Andrew Jackson Smith ' s division of the XIII Corps were both transferred to the XVI Corps . Maj . Gen . Hurlbut assumed direct command over these divisions known as the Right Wing and participated in the Meridian Expedition in February 1864 . During the Red River Campaign the Right Wing was attached to Maj . Gen . Nathaniel P . Banks ' Army of the Gulf with Andrew J . Smith in command . Tuttle ' s 1st Division was now commanded by Joseph A . Mower and A . J . Smith ' s division was also attached to Mower ' s command . One division from the XVII Corps was attached to the Right Wing . This division was dubbed the " Red River Division " and was commanded by Thomas Kilby Smith . The Red River Division remained in Louisiana while A . J . Smith took the rest of the Right Wing into Mississippi to protect Sherman ' s supply lines during the Atlanta Campaign , defeating the Confederates at the Battle of Tupelo . Here the two divisions were commanded by Mower ( 1st Division ) and Colonel David Moore ( 2nd Division ) with a division of cavalry temporarily attached under Brig . Gen . Benjamin Grierson . Dissolution . The corps in its entirety was discontinued on November 7 , 1864 . Andrew J . Smith remained in command of his two divisions and were sent to Missouri to help defeat Sterling Prices ' s Missouri Raid . During this time Smith ' s command , once known as the Right Wing - XVI Corps , was now officially titled " Detachment - Army of the Tennessee " . Smith was then sent to Tennessee to join with Maj . Gen . George H . Thomas for the battle of Nashville . At Nashville Smith had three divisions being commanded respectively by John McArthur , Kenner Garrard and Col . Jonathan B . Moore . McArthur ' s division took a prominent part in both days of the battle . Re - activation . On February 18 , 1865 Smith ' s Detachment - Army of the Tennessee became the official XVI Corps . It was composed of three divisions : First ( McArthur ) , Second ( Garrard ) and Third ( Carr ) . The composition remained virtually the same as it had at Nashville except Brig . Gen . Eugene A . Carr replaced Col . Moore in command of the 3rd Division . It served in the operations of Maj . Gen . Edward Canby against Mobile , Alabama and fought in the battles of Spanish Fort and Fort Blakely . The latter ended on April 9 , 1865 , the day Lee surrendered at Appomattox and was the last infantry battle of the war . The corps was finally disbanded on July 20 , 1865 .