15th United States Infantry

== Regimental History and Service Record ==
Organized by direction of the President May 4, 1861, and confirmed by Act of Congress July 29, 1861. Regiment organized at Wheeling, W. Va. Ordered to Kentucky October, 1861. Attached to Rousseau's Brigade, McCook's Command, at Nolin, Ky., Dept. of the Ohio, to November, 1861. 4th Brigade, Army of the Ohio, to December, 1861. 4th Brigade, 2nd Division, Army of the Ohio, to September, 1862. 4th Brigade, 2nd Division, 1st Corps, Army of the Ohio, to November, 1862. 3rd Brigade, 2nd Division, Right Wing 14th Army Corps, Army of the Cumberland, to December, 1862. 4th Brigade, 1st Division (Center), 14th Army Corps, to January, 1863. 4th Brigade, 1st Division, 14th Army Corps, to April, 1863. 3rd Brigade, 1st Division, 14th Army Corps, to October, 1863. 2nd Brigade, 1st Division, 14th Army Corps, to October, 1864. Regular Brigade, Chattanooga, Tenn., Dept. of the Cumberland, to November, 1864. 1st Brigade, 1st Separate Division, District of the Etowah, Dept. of the Cumberland, to July, 1865.
SERVICE.--Camp at Bacon Creek and Green River, Ky., until February, 1862. March to Nashville, Tenn., February 14-25. Occupation of Nashville February 25. March to Duck River March 16-21, and to Savannah, Tenn., March 31-April 6. 
* April 6-7, 1862 - Battle of Shiloh, Tennessee
Advance on and siege of Corinth, Miss., April 29-May 30. At Corinth until June 10. Buell's Campaign in North Alabama and Middle Tennessee June to August. March to Louisville, Ky., in pursuit of Bragg August 21-September 26. Pursuit of Bragg to Crab Orchard, Ky., October 1-15. Lawrenceburg-Dogwalk October 8. Perryville October 9. March to Nashville, Tenn., October 17-November 7, and duty there until December 26. Advance on Murfreesboro, Tenn., December 26-30. Battle of Stone's River December 30-31, 1862, and January 1-3, 1863. Duty near Murfreesboro until June. Middle Tennessee (or Tullahoma) Campaign June 23-July 7. Hoover's Gap June 24-26. Beech Grove June 26. Occupation of Middle Tennessee until August 16. 
* August 16-September 22, 1863 - The Chickamauga Campaign
** September 19-20, 1863 - Battle of Chickamauga, Georgia
** Rossville Gap September 21. 
* September 24-October 27, 1863 - Siege of Chattanooga, Tennessee
* Reopening Tennessee River October 26-29.
* November 23-27, 1863 - The Chattanooga/Ringgold Campaign (1st and 2nd Battalions)Not originally referenced on unit homepage
** November 23-25, 1863 - Battles of Chattanooga, Tennessee
** Orchard Knob November 23-24.
** Mission Ridge November 25.
** Graysville November 26.
** Pea Vine Valley November 27.
* Reconnaissance of Dalton, Ga., February 22-27, 1864.
* Tunnel Hill, Buzzard's Roost Gap and Rocky Faced Ridge February 23-25. 
* May 1-September 8, 1864 - The Atlanta Campaign
** May 8-11, 1864 - Demonstration against Rocky Faced Ridge, 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
** Pickett's Mills May 27. 
** Operations about Marietta and against Kenesaw Mountain June 10-July 2. 
** Pine Hill June 11-14. 
** Lost Mountain June 15-17. 
** Assault on Kenesaw June 27. 
** Ruff's Station, Smyrna Camp Ground, July 4. 
** Chattahoochie River July 5-17. 
** Peach Tree Creek July 19-20. 
** July 22-August 25, 1864 - Siege of Atlanta, Georgia
** Utoy Creek August 5-7. 
** Flank movement on Jonesboro August 25-30. 
** Battle of Jonesboro August 31-September 1. 
** At Atlanta, Ga., until September 28. 
* Moved to Chattanooga September 28-30, thence to Lookout Mountain and duty there until July, 1865.
** December 2-3, 1864 - Skirmishes near Chattanooga, TennesseeNot originally referenced on unit homepage (2 companies)
== Regimental Roster ==
== Regiment Statistical Information ==
* Regiment lost during service 3 Officers and 131 Enlisted men killed and mortally wounded and 1 Officer and 228 Enlisted men by disease. Total 363.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 701, 704, 705, 707, 715, 846, 860, 862, 866, 875, 1714)
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