The 99th Ohio Infantry Regiment, sometimes 99th Ohio Volunteer Infantry (or 99th OVI) was an infantry regiment in the Union Army during the American Civil War.
The 99th Ohio Infantry was organized at Camp Lima in Allen County, Ohio and mustered in for three years service on August 26, 1862, under the command of Colonel Albert Longworthy. The regiment was recruited in Allen, Auglaize, Hancock, Mercer, Putnam, Shelby, and Van Wert counties.
The regiment was attached to 23rd Brigade, 5th Division, Army of the Ohio, September 1862. 23rd Brigade, 5th Division, II Corps, Army of the Ohio, to November 1862. 3rd Brigade, 3rd Division, Left Wing, XIV Corps, Army of the Cumberland, to January 1863. 3rd Brigade, 3rd Division, XXI Corps, Army of the Cumberland, to October 1863. 2nd Brigade, 1st Division, IV Corps, Army of the Cumberland, to June 1864. 2nd Brigade, 1st Division, XXIII Corps, Army of the Ohio, June 1864. 4th Brigade, 2nd Division, XXIII Corps, to August 1864. 1st Brigade, 2nd Division, XXIII Corps, to December 1864.
The 99th Ohio Infantry ceased to exist on December 31, 1864, when it was consolidated with the 50th Ohio Infantry.
Ordered to Lexington, Ky., August 31, thence moved to Cynthiana, Ky., September 3, thence to Covington, Ky., and to Louisville, Ky., September 17. Pursuit of Bragg into Kentucky October 1âÂÂ15. Battle of Perryville, Ky., October 8 (reserve). March to Nashville, Tenn., October 16-November 7, and duty there until December 26. Advance on Murfreesboro, Tenn., December 26âÂÂ30. Battle of Stones River December 30âÂÂ31, 1862 and January 1âÂÂ3, 1863. Duty at Murfreesboro until June. Tullahoma Campaign June 23-July 7. March to McMinnville, and duty there until August 16. Passage of the Cumberland Mountains and Tennessee River and Chickamauga Campaign August 16-September 22. Battle of Chickamauga September 19âÂÂ20. Siege of Chattanooga September 24-November 23. Reopening Tennessee River October 26âÂÂ29. Chattanooga-Ringgold Campaign November 23âÂÂ27. Orchard Knob November 23. Lookout Mountain November 23âÂÂ24. Missionary Ridge November 25. Pigeon Hills November 26. Ringgold Gap, Taylor's Ridge, November 27. Camp at Shellmound until February, 1864. Demonstration on Dalton, Ga., February 22âÂÂ27. Tunnel Hill, Buzzard's Roost Gap, and Rocky Faced Ridge February 23âÂÂ25. At Cleveland until May. Atlanta Campaign May 1-September 8. Tunnel Hill May 6âÂÂ7. Demonstration on Rocky Raced Ridge May 8âÂÂ11. Buzzard's Roost Gap May 8âÂÂ9. Demonstrations on Dalton May 9âÂÂ13. Battle of Resaca May 14âÂÂ15. Near Kingston May 18âÂÂ19. Near Cassville May 19. Advance on Dallas May 22âÂÂ25. Operations on line of Pumpkin Vine Creek and battles about Dallas, New Hope Church and Allatoona Hills May 25-June 5. Operations about Marietta and against Kennesaw Mountain June 10-July 2. Pine Hill June 11âÂÂ14. Lost Mountain June 15âÂÂ17. Muddy Creek June 17. Noyes Creek June 19. Kolb's Farm June 22. Assault on Kennesaw June 27. Nickajack Creek July 2âÂÂ5. Ruff's Mills July 3âÂÂ4. Chattahoochie River July 5âÂÂ17. Decatur July 19. Siege of Atlanta July 22-August 25. Utoy Creek August 5âÂÂ7. Flank movement on Jonesboro August 25âÂÂ30. Battle of Jonesboro August 31-September 1. Lovejoy's Station September 2âÂÂ6. Pursuit of Hood into Alabama October 3âÂÂ26. Nashville Campaign NovemberâÂÂDecember. Columbia, Duck River, November 24âÂÂ27. Battle of Franklin November 30. Battle of Nashville December 15âÂÂ16. Pursuit of Hood to the Tennessee River December 17âÂÂ28.
The regiment lost a total of 342 men during service; 4 officers and 80 enlisted men killed or mortally wounded, 2 officers and 256 enlisted men died of disease.