18th 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 Columbus, Ohio. Ordered to Louisville, Ky., December 2, 1861. Attached to 3rd Brigade, 1st Division, Army of the Ohio, to September, 1862. 3rd Brigade, 1st Division, 3rd Corps, Army of the Ohio, to November, 1862. 3rd Brigade, 3rd Division (Center), 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.--Operations in Southeast Kentucky December, 1861, to February, 1862. Advance to Camp Hamilton, Ky., January 1-17, 1862. Logan's Cross Roads, Mill Springs, January 19-20. Moved to Louisville, Ky., thence to Nashville, Tenn., February 10-March 2. March to Savannah, Tenn., March 20-April 6. Battle of Shiloh, Tenn., April 6-7. Advance on and siege of Corinth, Miss., April 29-May 30. 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 into Kentucky October 1-22. Near Bardstown October 6. 
* October 8, 1862 - Battle of Perryville, Kentucky 
March to Nashville, Tenn., October 22-November 7, and duty there until December 26. Advance on Murfreesboro December 26-30. Battle of Stone's River December 30-31, 1862, and January 1-3, 1863. Duty near Murfreesboro until June. Eaglesville March 2 (Detachment). 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-September 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
** November 23-25, 1863 - Battles of Chattanooga, Tennessee (1st and 2nd Battalions)
** Orchard Knob November 23-24.
** Mission Ridge November 25.
** Graysville November 26. 
** Pea Vine Creek 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 Mountain 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 until September 28. 
* Moved to Chattanooga, Tenn., September 28-30, thence to Lookout Mountain and duty there until July, 1865.
== Regimental Roster ==
== Regiment Statistical Information ==
Source 	Casualties	Remarks
Dyer 	
* 9 Officers and 209 enlisted men killed and mortally wounded 
* 6 Officers and 246 enlisted men killed by disease
* Total 470	None
Fox 	
* 9 Officers and 209 enlisted men killed and mortally wounded
* Total 218 (Combat Losses)
* Fox lists this unit as 26th on the list of units "sustaining greatest loss in action" (Infantry units with over 200 casualties)	
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 701, 704, 705, 707, 715, 733, 860, 862, 866, 1715)
* (Page 3)
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