12th Missouri Infantry (U)

== Regimental History and Service Record ==
Organized at St. Louis, Mo., August, 1861. Attached to Fremont's Army of the West to January, 1862. 2nd Brigade, Army of Southwest Missouri, to February, 1862. 2nd Brigade, 1st Division, Army of Southwest Missouri, to May, 1862. 3rd Division, Army of Southwest Missouri, to July, 1862. District of Eastern Arkansas, Dept. of Missouri, to December, 1862. 1st Brigade, 11th Division, Right Wing 13th Army Corps (Old), Dept. of the Tennessee, to December, 1862. 2nd Brigade, 4th Division, Sherman's Yazoo Expedition, to January, 1863. 2nd Brigade, 1st Division, to September, 1863. 1st Brigade, 1st Division, 15th Army Corps, to December, 1863. 3rd Brigade, 1st Division, 15th Army Corps, to November, 1864.
SERVICE.--Fremont's advance on Springfield, Mo., September to November, 1861. Moved to Jefferson City, thence to Sedalia and Springfield. To Wilson's Creek October 6-8. Duty at Rolla until January, 1862. Expedition to Danville December 26, 1861. Curtis' Campaign in Missouri and Arkansas against Price January to March, 1862. Advance on Springfield February 2-16. Pursuit of Price into Arkansas February 14-29. Battles of Pea Ridge, Ark., March 6-8. March to Batesville April 5-May 3; thence to Helena, Ark., May 25-July 14. Expedition from Helena to mouth of White River August 5-8. Moved to Ironton-Pilot Knob, Mo., September 1. To St. Genevieve November 12, and return to Helena November 23. Sherman's Yazoo Expedition December 22, 1862, to January 3, 1863. Chickasaw Bayou December 26-28. Chickasaw Bluff December 29. Expedition to Arkansas Post, Ark., January 3-10, 1863. Assault and capture of Fort Hindman, Arkansas Post, January 10-11. Moved to Young's Point, La., January 17-23. Duty there until March and at Milliken's Bend until April. Expedition to Greenville, Black Bayou and Deer Creek April 2-14. Demonstration on Haines and Drumgould's Bluffs April 29-May 2. Moved to join army in rear of Vicksburg, Miss., via Richmond and Grand Gulf May 2-14. Mississippi Springs May 12-13. Jackson May 14. 
* May 18-July 4, 1863 - Siege of Vicksburg, Mississippi
** May 19, 1863 - Assault on Vicksburg, Mississippi
** May 22, 1863 - Assault on Vicksburg, Mississippi
* Advance on Jackson, Miss., July 4-10. 
* Siege of Jackson July 10-17. 
* Bolton's Depot July 16. 
* Brier Creek, near Canton, July 17, 
* Clinton July 18. 
* Camp at Big Black until September 27. 
* September 26-November 20, 1863 - Expedition from Vicksburg, Mississippi to Chattanooga, Tennessee
* Operations on Memphis & Charleston Railroad in Alabama October 20-29. 
* Cherokee Station October 21 and 29.
* Cane Creek October 26. Tuscumbia October 26-27. 
* November 23-27, 1863 - The Chattanooga/Ringgold Campaign
** November 23-25, 1863 - Battles of Chattanooga, Tennessee
** Lookout Mountain November 23-24
** Mission Ridge November 25
** Ringgold Gap, Taylor's Ridge, November 27.
* March to relief of Knoxville November 28-December 8.
* Garrison duty in Alabama at Woodville and Scottsboro, Ala., and at Cleveland, Tenn., to May, 1864. 
* May 1-September 8, 1864 - The Atlanta Campaign
** May 8-13, 1864 - Demonstration on Resaca, Georgia
*** May 13, 1864 - Combat at Resaca, Georgia
** May 14-May 15, 1864 - Battle of Resaca, Georgia
** Advance on Dallas May 18-25. 
** May 25-June 5, 1864 - Operations in Bartow County, Georgia
** Operations about Marietta and against Kenesaw Mountain June 10-July 2. 
** Bushy Mountain June 15-17. 
** Assault on Kenesaw June 27. 
** Nickajack Creek July 2-5. 
** Chattahoochie River July 6-17. 
** July 22, 1864 - Battle of Atlanta, Georgia
** July 22-August 25, 1864 - Siege of Atlanta, Georgia
** Ezra Chapel, Hood's 2nd Sortie, July 28. 
** Flank movement on Jonesboro August 25-30. 
** Lovejoy Station September 2-6. 
* Pursuit of Hood into Alabama October 1-21. 
* Mustered out by Companies from August 12 to November 14, 1864. 
** Consolidated with Detachments from (II) 3rd Missouri Infantry (U) and 17th Missouri Infantry (U) and subsequently transferred to 15th Missouri Infantry (U)
== Regimental Roster ==
== Regiment Statistical Information ==
Source 	Casualties	Remarks
Dyer 	
* 10 Officers and 102 enlisted men killed and mortally wounded 
* 2 Officers and 94 enlisted men killed by disease
* Total 208	None
Fox 	
* Fox lists this unit as:
** 107th on the list of units with losses based on duration of the entire term of service of the unit (3rd of the Missouri troops)	None
WotRWiki Statistics	
* troops killed
** Includes troops mortally wounded
** Includes troops killed by disease
** All others are troops killed in action or under special circumstances	
== Legacy ==
== Notes ==
== Sources == 
* (Pages 703, 705, 707, 715, 779, 783, 866, 1328)
* (Page 12)
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