The 15th Missouri Infantry Regiment was organized at
St. Louis, Missouri August–September 1861 and mustered in for three years on under the command of
Colonel Francis J. Joliat. The regiment was attached to Fremont's Army of the West to January 1862. 5th Brigade, Army of Southwest Missouri, to March 1862. 1st Brigade, 2nd Division, Army of Southwest Missouri, to May 1862. 1st Brigade, 5th Division,
Army of the Mississippi, to September 1862. 35th Brigade, 11th Division,
Army of the Ohio, to October 1862. 35th Brigade, 11th Division,
III Corps, Army of the Ohio, to November 1862. 2nd Brigade, 3rd Division, Right Wing,
XIV Corps,
Army of the Cumberland, to January 1863. 2nd Brigade, 3rd Division,
XX Corps, Army of the Cumberland, to October 1863, 1st Brigade, 2nd Division,
IV Corps, to April 1864. 3rd Brigade, 2nd Division, IV Corps, to June 1865. 2nd Brigade, 2nd Division, IV Corps, to August 1865. Department of Texas to December 1865. The 15th Missouri Infantry mustered out of service at
Victoria, Texas on December 25, 1865. ==Detailed service==