From Joseph Crute, Jr.'s book, Units of the Confederate States Army ~
"Organized at Auburn, Alabama in May 1862. Companies that made up the unit were from the counties of Barbour, Randolph, Lowndes, Macon, and Russell. It was immediately sent to Mississippi and at Tupelo suffered from camp diseases. Later it moved to Kentucky, fought at Perryville under General Walthall, then was assigned to General Woods', Lowrey's, and Shelley's Brigade, Army of Tennessee. The 45th participated in the difficult campaigns of the army from Murfreesboro to Atlanta, was with Hood in Tennessee, and ended the war in North Carolina. It was organized with 750 men, reported 91 casualties at Murfreesboro and 117 at Chickamauga, and totaled 366 effectives and 309 arms in December 1863. The regiment lost 27 killed, 72 wounded, and 32 missing at the Battle of Atlanta and was almost annihilated at Franklin. Only a remnant surrendered on April 26, 1865. The field officers were Colonels Ephraim B. Breedlove, James G. Gilchrist, William S. Goodwyn, and Harris D. Lampley; Lieutenant Colonel Robert H. Abercrombie; and Major George C. Freeman."
From Stewart Sifakis' Alabama volume in his book series, Compendium of the Confederate Armies ~
ORGANIZATION: Organized at Auburn on May 19, 1862. Companies D and H had been part of the 34th Infantry Regiment. Field consolidation with the 16th and 33rd Infantry Regiments from the fall of 1864 to April 8, 1865. Consolidated with the 1st (apparently), 16th, and 33rd Infantry Regiments at Smithfield, North Carolina on April 8, 1865.
FIRST COMMANDER: William S. Goodwyn (Colonel)
FIELD OFFICERS: Robert H. Abercrombie (Major, Lt. Colonel), Ephraim B. Breedlove (Major, Lt. Colonel, Colonel), George C. Freeman (Major), James C. Gilchrist (Lt. Colonel, Colonel), Harris D. Lampley (Major, Lt. Colonel, Colonel)
ASSIGNMENTS:
2nd Brigade, 2nd Corps, Army of the Mississippi, Dept. #2 (Jun-Jul 1862)
2nd Brigade, 2nd Division, Army of the Mississippi, Dept. #2 (Jul 1862)
3rd Brigade, 2nd Division, Army of the Mississippi, Dept #2 (Aug 1862)
3rd Brigade, 2nd Division, Left Wing, Army of the Mississippi, Dept. #2 (Aug-Nov 1862)
Walthall's Brigade, Anderson's Division, 2nd Corps, Army of Tennessee (Nov-Dec 1862)
Anderson's Brigade, Withers' Division, 1st Corps, Army of Tennessee (Dec 1862-Jan 1863)
Woods's-Lowrey's Brigade, Cleburne's Division, 2nd Corps, Army of Tennessee (Apr-Nov 1863)
Lowrey's Brigade, Cleburne's Division, 1st Corps, Army of Tennessee (Nov 1863-Apr 1865)
BATTLES:
Perryville (Oct 8, 1963)
Murfreesboro (Dec 31, 1862-Jan 3 1863)
Tullahoma Campaign (Jun 1863)
Chickamauga (Sep 19-20, 1863)
Chattanooga Siege (Sep-Nov 1863)
Chattanooga (Nov 23-25, 1863)
Atlanta Campaign (May-Sep 1864)
Resaca (May 14-15, 1864)
New Hope Church (May 25-Jun 4, 1864
Kennesaw Mountain (Jun 27, 1864)
Peach Tree Creek (July 20, 1864)
Atlanta (July 22, 1864)
Atlanta Siege (July-Sep 1864)
Jonesboro (Aug 31-Sep 1, 1864)
Spring Hill (Nov 29, 1864)
Franklin (Nov 30, 1864)
Nashville (Dec 15-16, 1864)
Carolinas Campaign (Feb-Apr 1865)