Organized at Keokuk August 30 to September 14, 1861. Moved to Benton Barracks, Mo., November 4-6, and duty there till February 4, 1862. (Cos. "E," "F" "G" and "H" detached to Jefferson City, Mo., December 12, 1861, and duty in Northern and Southern Missouri till July, 1863. See service following that of Regiment.) Cos. "A," "B," "C," "D," "I," "K," "L" and "M" moved to Rolla, Mo., February 4-6, 1862. (Cos. "I" and "K" detached to garrison, Salem, Mo., February 11, 1862. Scout to Mawameck February 12. Expedition to Mt. Vernon February 18-19. Action at West Plains February 20. Scouting after Coleman's guerillas till April. Actions near Salem February 28 and March 18. Rejoin Regiment near Forsythe April, 1862.) Regiment march to join General Curtis February 14-18. (Co. "L" detached at Springfield, Mo.) Attached to Curtis' Army of Southwest Missouri, Dept. of Missouri, February to May, 1862. 3rd Brigade, 1st Division, Army of Southwest Missouri, to July, 1862. District of Eastern Arkansas, Dept. of Missouri, to October, 1862. 3rd Brigade, 4th Division, District of Eastern Arkansas, to December, 1862. 2nd Brigade, Cavalry Division, District of Eastern Arkansas, Dept. of Tennessee, to January, 1863. 2nd Brigade, 2nd Cavalry Division, 13th Corps, Dept. of Tennessee, to April, 1863. 2nd Brigade, Cavalry Division, District of Eastern Arkansas, Dept. of Tennessee, to June, 1863. Bussy's Cavalry Brigade, Herron's Division, Dept. of Tennessee, to August, 1863. Reserve Cavalry Brigade, Army of Arkansas, to January, 1864. 1st Brigade, 1st Division, 7th Army Corps, Dept. of Arkansas, to May, 1864. 2nd Brigade, Cavalry Division, 16th Corps, Dept. of Tennessee, to June, 1864. 2nd Brigade, 2nd Cavalry Division, District of West Tennessee, to December, 1864. 2nd Brigade, Cavalry Division, District of West Tennessee, to February, 1865. 1st Brigade, 4th Division, Wilson's Cavalry Corps, Military Division Mississippi, to June, 1865. District of Georgia to August, 1865.

SERVICE:
Expedition to Fayetteville, Ark., February 22, 1862. Battles of Pea Ridge March 6-8. (Cos. "D" and "M" escort prisoners to Rolla, Mo., March 12-31.) March to Batesville via Cassville, Forsythe, Osage and West Plains April 6-May 1. (Cos. "L" and "M" detached at Lebanon, Mo., operating against guerillas till November, 1862; then join Cos. "E," "F," "G" and "H"). (Co. "D" guard train to Rolla, Mo., May 25 to June 20.) Action at Kickapoo Bottom, near Sylamore, May 29. Sylamore May 30. Foraging and scouting at Sulphur Rock June 1-22. Waddell's Farm, Village Creek, June 12. March from Batesville to Clarendon on White River June 25-July 9. Waddell's Farm June 27 (Co. "K"). Stewart's Plantation, Village Creek, June 27. Bayou Cache July 6 (Co. "I"). Hill's Plantation, Cache River, July 7. March to Helena July 11-14. Duty there and scouting from White River to the St. Francis till June, 1863. Expedition from Clarendon to Lawrenceville and St. Charles September 11-13, 1862. LaGrange September 11. Marianna and LaGrange November 8. Expedition to Arkansas Post November 16-21. Expedition to Grenada, Miss., November 27-December 5. Oakland, Miss., December 3. Expedition up St. Francis and Little Rivers March 5-12, 1863 (Detachment). Expedition to Big and Little Creeks and skirmishes March 6-10. Madison, Ark., March 9 (Detachment). Madison, Ark., April 14 (Detachment). LaGrange May 1. Polk's Plantation, Helena, May 25. Moved to Vicksburg, Miss., June 4-8. Siege of Vicksburg June 8-July 4. Advance on Jackson, Miss., July 5-10. Near Clinton July 8. Siege of Jackson July 10-17. Near Canton July 12. Canton, Bolton's Depot and Grant's Ferry, Pearl River, July 16. Bear Creek, near Canton, July 17. Canton July 18. At Flowers' Plantation till August 10. Raid from Big Black on Mississippi Central Railroad and to Memphis, Tenn., August 10-22. Payne's Plantation, near Grenada, August 18. Panola August 20. Coldwater August 21. Moved to Helena, Ark., August 26; thence moved to Little Rock, arriving October 1. Duty at Berton, Ark., October 1 to December 20. Expedition to Mt. Ida November 10-18. Near Benton December 1. Expedition to Princeton December 8-10. Ordered to Little Rock December 20. Regiment Veteranize January 5, 1864. Veterans on furlough January 6 to February 5. At St. Louis, Mo., February 6 to April 26. Ordered to Memphis, Tenn., April 26. Operations against Forest May to August. Sturgis' Expedition to Guntown, Miss., June 1-13. Near Guntown June 10. Ripley June 11. Smith's Expedition to Tupelo, Miss., July 5-21. Saulsbury July 2. Near Kelly's Mills July 8. Cherry Creek July 10. Huston Road July 12. Okolona July 12-13. Harrisburg, near Tupelo, July 14-15. Old Town or Tishamingo Creek July 15. Ellistown July 16 and 21. Smith's Expedition to Oxford, Miss., August 1-30. Tallahatchie River August 7-9. Holly Springs August 8. Hurricane Creek and Oxford August 9. Hurricane Creek August 13, 14 and 19. College Hill August 21. Hurricane Creek August 22. Repulse of Forrest's attack on Memphis August 21 (Detachment). Moved to Brownsville, Ark., September 2. Campaign against Price in Arkansas and Missouri September-November. Independence, Big Blue and State Line October 22. Westport October 23. Battles of Charlot, Marias des Cygnes, Mine Creek, Little Osage River October 25. White's Station, Tenn., December 4 (Detachment). Grierson's Raid from Memphis on Mobile & Ohio Railroad December 27, 1864, to January 6, 1865 (Detachment). Near White's Station December 25. Okolona December 27. Egypt Station, Miss., December 28. Mechanicsburg January 3, 1865. At the Pond January 4. Moved from Vicksburg, Miss., to Memphis, Tenn.; thence to Louisville, Ky., January 6-15, 1865, and rejoin Regiment. Regiment at St. Louis, Mo., and Louisville, Ky., till February, 1865. Moved to Chickasaw, Ala.; Wilson's Raid to Macon, Ga., March 22-April 24. Montevallo March 31. Six-Mile Creek March 31. Maplesville April 1 (Co. "L"). Ebeneezer Church, near Maplesville, April 1. Selma April 2. Fike's Ferry, Cahawba River, April 7 (Co. "B"). Montgomery April 12. Columbus, Ga., April 16. Capture of Macon April 20. Duty at Macon and at Atlanta, Ga., till August. Mustered out August 9, 1865.

Regiment lost during service 5 Officers and 79 Enlisted men killed and mortally wounded and 4 Officers and 230 Enlisted men by disease. Total 318.

Companies "E," "F," "G" and "H" ordered to Jefferson City, Mo., December 12, 1861. Attached to Army of Southwest Missouri to February, 1862. District of North Missouri to August, 1862. District of Southwest Missouri to November, 1862. Cavalry Brigade, District of Southeast Missouri, to June, 1863. Reserve Cavalry Brigade, Army of Southeast Missouri, to August, 1863. Reserve Brigade, 1st Cavalry Division, Arkansas Expedition, to October, 1863.

SERVICE:
Engaged in operations against guerillas about Booneville, Glasgow, Fulton and in North Missouri at Lebanon, and in Southwest Missouri covering frontier from Iron Mountain to Boston Mountains till June, 1863. Companies "L" and "M" joined November, 1862. Actions at Florida, Mo., May 22, 1862. Salt River, near Florida, May 31. Boles' Farm, Florida, July 22 and 24. Santa Fe July 24-25. Brown Springs July 27. Moore's Mills, near Fulton, July 28. Kirksville August 26. Occupation of Newtonia December 4. Hartsville, Wood's Fork, January 11, 1863. Operations against Marmaduke April 17-May 2. Cape Girardeau April 26. Near Whitewater Bridge April 27. Castor River, near Bloomfield, April 29. Bloomfield April 30. Chalk Bluffs, St. Francis River, April 30-May 1. Davidson's march to Clarendon, Ark., August 1-8. Steele's Expedition to Little Rock August 8-September 10. Reed's Bridge or Bayou Metoe August 27. Shallow Ford, Bayou Metoe, August 30. Bayou Fourche and capture of Little Rock September 10. Rejoined Regiment at Little Rock October 1, 1863.