21st Missouri Volunteer Infantry The 21st Missouri Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War . Service . Organized February 1 , 1862 , from 1st and 2nd Northeast Regiments Missouri Infantry . Attached to Dept . of Missouri to March , 1862 . 1st Brigade , 6th Division , Army of the Tennessee , to July , 1862 , 1st Brigade , 6th Division , District of Corinth , Miss . , to November , 1862 . 1st Brigade , 6th Division , Left Wing 13th Army Corps ( Old ) , Dept . of the Tennessee , to December , 1862 . District of Columbus , Ky . , 16th Army Corps , Dept . of the Tennessee , to May , 1863 . 4th Brigade , District of Memphis , Tenn . , 5th Division , 16th Army Corps , to January , 1864 . 1st Brigade , 3rd Division , 16th Army Corps , to December , 1864 . 1st Brigade , 2nd Division , Detachment Army of the Tennessee , Dept . of the Cumberland , to February , 1865 . 1st Brigade , 2nd Division , 16th Army Corps ( New ) , Military Division West Mississippi , to August , 1865 . Dept . of Alabama to April , 1866 . Detailed service . Ordered to Pittsburg Landing , Tenn . , March , 1862 . Battle of Shiloh , Tenn . , April 6 – 7 . Advance on and siege of Corinth , Miss . , April 29 - May 30 . Occupation of Corinth and pursuit to Booneville May 31 - June 12 . Duty at Corinth until September . Battle of Iuka September 19 . Battle of Corinth October 3 – 4 . Pursuit to Ripley October 5 – 12 . Grant ' s Central Mississippi Campaign November , 1862 , to January , 1863 . On post and garrison duty at Columbus , Ky . ; Union City , Tenn . ; Clinton , Ky . , and Memphis , Tenn . , until January , 1864 . Ordered to Vicksburg , Miss . , January 26 . Actions with guerrillas at Islands Nos . 70 and 71 , Mississippi River , while en route , January 29 , on steamer " William Wallace , " Meridian Campaign February 3 - March 2 . Queen Hill February 4 . Red River Campaign March 10 - May 22 . Fort DeRussy March 14 . Occupation of Alexandria , La . , March 16 . Battle of Pleasant Hill April 9 . About Cloutiersville April 22 – 24 . At Alexandria April 26 - May 13 . Retreat to Morganza May 13 – 20 . Mansura May 16 . Yellow Bayou May 18 . Moved to Vicksburg , Miss . . thence to Memphis , Tenn . , May 22 - June 10 . Action at Old River Lake or Lake Chicot June 5 – 6 . Smith ' s Expedition to Tupelo , Miss . , July 5 – 21 . Camargo ' s Cross Roads , near Harrisburg , July 13 . Tupelo July 14 – 15 . Old Town Creek July 15 . Smith ' s Expedition to Oxford , Miss . , August 1 – 30 . Tallahatchie River August 7 – 9 . Abbeville August 23 . Moved to Duvall ' s Bluff , Ark . , September 1 – 6 . March through Arkansas and Missouri in pursuit of Price September 17 - November 16 . Lone Jack November 1 . Moved to Nashville , Tenn . , November 25 December 1 . Battle of Nashville December 15 – 16 . Pursuit of Hood to the Tennessee River December 17 – 28 . Moved to Clifton , Tenn . , thence to Eastport , Miss . , January 2 – 7 , 1865 , and duty there until February 9 . Moved to Vicksburg , Miss . , thence to New Orleans , La . , February 9 – 21 . Campaign against Mobile and its Defenses March 17 - April 12 . Siege of Spanish Fort and Fort Blakely March 26 - April 8 . Assault and capture of Fort Blakely April 9 . Occupation of Mobile April 12 . March to Montgomery April 13 – 25 , and duty there until June . Moved to Mobile June 1 . Duty at Mobile and other points in Alabama until April , 1866 . Mustered out April 19 , 1866 . Casualties . Regiment lost during service 2 Officers and 68 Enlisted men killed and mortally wounded and 5 Officers and 234 Enlisted men by disease . Total 309 .