The 27th Missouri Infantry Regiment was organized at St. Louis, Missouri, September 2, 1862 through January 3, 1863 and mustered in for three years service under the command of Colonel Thomas Curley.
The regiment was attached to District of Rolla, Department of Missouri, to March 1863.
1st Brigade, 1st Division, XV Corps, Army of the Tennessee, to June 1865.
On duty at Chillicothe, Mo., and as provost guard at St. Louis during organization of the regiment.
Ordered to join the Army of the Tennessee before Vicksburg, Miss., arriving there March 20.
Black Bayou and Deer Creek April 2–14.
Demonstration on Haines and Drumgould's Bluffs April 29-May 2.
Moved to join the army in rear of Vicksburg, Miss., via Richmond and Grand Gulf May 2–14.
Moved to Memphis, then marched to Chattanooga, Tenn., September 27-November 21.
Operations on Memphis & Charleston Railroad in Alabama October 20–29.
Ringgold Gap, Taylor's Ridge, November 27.
Battles about Dallas, New Hope Church, and Allatoona Hills May 25-June 5.
Operations about Marietta and against Kennesaw Mountain June 10-July 2.
Ezra Chapel, Hood's 2nd Sortie, July 28.
Ship's Gap, Taylor's Ridge, October 16.