Ohio Civil War Union Units 1st through 8th

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1st Regiments

• 1st Regiment, Ohio Infantry (3 months, 1861)
  Organized at large: April 14 to April 29, 1861. Mustered in: April 17, 1861.
  Length of service: 3 months.
  Mustered out: August 2, 1861 in Ohio.
  

• 1st Regiment, Ohio Infantry
  Mustered in: August 5 to October 30, 1861 at Camp Corwin, Dayton, Ohio.
  Mustered out: September 24 to October 14, 1864. Recruits transferred to 18th Ohio Volunteers Infantry October 31, 1864. Ordered to the reach for muster out.
  

• 1st Regiment, Ohio Cavalry.
  Mustered in: August 17-October 30, 1861 at Camp Chase, Ohio.
  Mustered out: September 13, 1865 at Georgia and South Carolina.
  

• 1st Regiment, Ohio Light Artillery Militia (3 months, 1861).
  "Compendium of the War of the Rebellion" by Frederick H. Dyer contains no history for this unit.
  

• 1st Independent Battery, Ohio Light Artillery.
  Mustered in: August 6, 1861.Organized at: Camp Chase, Columbus, Ohio.
  Mustered out: June 26, 1865 at Washington, District of Columbia.
  

• 1st Regiment, Ohio Light Artillery
  Mustered in: Between August and December 1861 at various places in Ohio.
  Mustered out: June through August 1865.
  

• 1st Regiment, Ohio Heavy Artillery
  Mustered in: September 15, 1862 at Portsmouth, Ohio, as the 117th Ohio Volunteer Infantry.
  Mustered out: July 25, 1865 at Deptartment of the Cumberland.
  

• 1st Battalion, Ohio Sharpshooters.
  "Compendium of the War of the Rebellion" by Frederick H. Dyer contains no history for this unit.
  

2nd Regiments

• 2nd Regiment, Ohio Infantry (3 months, 1861)
  Mustered in: April 18, 1861 at Columbus, Ohio.
  Mustered out: July 31, 1861 at Virginia.
  

• 2nd Regiment, Ohio Infantry
  Mustered in: July 17 to September 20, 1861 at Camp Dennison, Ohio.
  Mustered out: October 10, 1864 expiration of term. Recruits transferred to 18th Ohio Infantry and mustered out at Chattanooga, Tennessee.
  

• 2nd Regiment, Ohio Infantry Militia (30 days, 1862)
  "Compendium of the War of the Rebellion" by Frederick H. Dyer contains no history for this unit.
  

• 2nd Regiment, Ohio Infantry Militia
  "Compendium of the War of the Rebellion" by Frederick H. Dyer contains no history for this unit.
  

• 2nd Regiment, Ohio Cavalry
  Mustered in: August to October, 1861 at Cleveland and Camp Dennison, Ohio.
  Mustered out: October 12, 1865 at Department of Missouri.
  

• 2nd Independent Battery, Ohio Light Artillery
  Mustered in: August 7, 1861 at Camp Chase, Ohio.
  Mustered out: July 21, 1865 at Ship Island, Mississippi.
  

• 2nd Independent Battery, Ohio Light Artillery (National Guard) (60 days, 1864)
  Organized at Columbus, Ohio, for guard duty. 1st Company August 16,1864; 2nd Company October 18, 1864.
  Mustered out 1st Company October 15, 1864; 2nd Company December 16, 1864.
  

• 2nd Regiment, Ohio Heavy Artillery
  Mustered in: July through September 1863.
  Mustered out: August 23, 1865.
  

Regiments 3rd to 4th

• 3rd Regiment, Ohio Infantry (3 months, 1861)
  Organized at Camp Jackson, Columbus, Ohio, April 25, 1861.
  Moved to Camp Dennison, Ohio, April 28, and duty there until June 12. Reorganized for three years' service June 12, 1861. Three-months men mustered out July 24, 1861.
  

• 3rd Regiment, Ohio Infantry
  Mustered in: June 4, 1861 at Camp Dennison, near Cincinnati, Ohio.
  Mustered out: June 23, 1864 at Camp Dennison, Ohio.
  

• 3rd Independent Company, Ohio Cavalry
  Mustered in: July 4, 1861 at Cinncinati, Ohio.
  Mustered out: May 22, 1865.
  

• 3rd Regiment, Ohio Cavalry
  Mustered in: September 4-December 11, 1861 at Camp Worcester.
  Mustered out: August 14, 1865 at Georgia.
  

• 3rd Independent Battery, Ohio Light Artillery
  Mustered in: November 9, 1861 to March 15, 1862 at Canton, Minerva and Massillon, Ohio.
  Mustered out: August 1, 1865 at Camp Taylor, Ohio.
  

• 4th Regiment, Ohio Infantry (3 months, 1861)
  Mustered in: April 25, 1861 at Camp Jackson, Columbus, Ohio.
  Mustered out: July 24, 1861 at Camp Dennison, Ohio.
  

• 4th Battalion, Ohio Infantry
  "Compendium of the War of the Rebellion" by Frederick H. Dyer contains no history for this unit.
  

• 4th Regiment, Ohio Infantry
  Mustered in: June 4, 1861 at Camp Dennison, Ohio.
  Mustered out: July 12, 1865 at Washington, District of Columbia.
  

• 4th Independent Battalion, Ohio Cavalry
  Mustered in: August 3 to September 21, 1863 at Cincinnati, Ohio.
  Mustered out: February 15 to March 14, 1864.
  

• 4th Independent Company, Ohio Cavalry
  Mustered in: July 9, 1861 at Georgetown, Ohio.
  Mustered out: May 28, 1865 at Washington, District of Columbia.
  

• 4th Regiment, Ohio Cavalry
  Mustered in: August to November, 1861 at Cincinnati, Lima, St. Maryes and Camp Dennison, Ohio.
  Mustered out: July 15, 1865 at Nashville, Tennessee.
  

• 4th Independent Battery, Ohio Light Artillery
  Mustered in: August 17, 1861 at Cincinnati, Ohio.
  Mustered out: Non-Veterans mustered out August 29, 1864. Veterans and Recruits attached to Artillery Reserve, Nashville, Tennessee, attached to 10th Ohio Battery until March, 1865. Transferred to 10th Ohio Battery March 19, 1865.
  

Regiments 5th to 6th

• 5th Regiment, Ohio Infantry (3 months, 1861)
  Mustered in: April 20, 1861 at Camp Harrison, near Cincinnati, Ohio.
  Mustered out: July 24, 1861 at Camp Dennison, Ohio.
  

• 5th Regiment, Ohio Infantry
  Mustered in: June 20, 1861 at Camp Dennison, Ohio.
  Mustered out: July 26, 1865 at Louisville, Kentucky.
  

• 5th Independent Battalion, Ohio Cavalry (6 months, 1863-64)
  Mustered in: July 9-September 2, 1863 at Columbus. Ohio.
  Mustered out: February 15, 1864.
  

• 5th Regiment, Ohio Cavalry
  Mustered in: October 23-November 14, 1861 at Camp Dick Corwin, near Cincinnati, Ohio.
  Mustered out: October 30, 1865 at Sub-District of Morgantown, District of Western North Carolina, Department of North Carolina.
  

• 5th Independent Company, Ohio Sharpshooters
  Mustered in: February 25, 1863 at Camp Cleveland, Ohio.
  Mustered out: July 19, 1865 at Headquarters Generals Rosecrans and Thomas, Commanding Army and Department of the Cumberland.
  

• 5th Independent Battery, Ohio Light Artillery
  Mustered in: August 31, 1861 at St. Louis, Missouri.
  Mustered out: July 31, 1865 at Little Rock.
  

• 6th Regiment, Ohio Infantry (3 months, 1861)
  Mustered in: April 27, 1861 at Camp Harrison, near Cincinnati, Ohio.
  Mustered out: July 24, 1861 at Camp Dennison, Ohio.
  

• 6th Regiment, Ohio Infantry
  Mustered in: June 18, 1861 at Camp Dennison, Ohio.
  Mustered out: June 23, 1864 at Camp Dennison, Ohio.
  

• 6th Regiment, Ohio Infantry Militia (1 month, 1862)
  "Compendium of the War of the Rebellion" by Frederick H. Dyer contains no history for this unit.
  

• 6th Independent Company, Ohio Sharpshooters
  Mustered in: December 30, 1862 at Camp Cleveland, Ohio.
  Mustered out: July 19, 1865 at Headquarters of Generals Rosecrans and Thomas, Commanding Army and Department of the Cumberland.
  

• 6th Regiment, Ohio Cavalry
  Mustered in: October 7, 1861 at Warren, Ohio.
  Mustered out: August 7, 1865 at Sub-District of the Appomattox, Department of Virginia.
  

• 6th Independent Battery, Ohio Light Artillery
  Mustered in: November 20, 1861 at Camp Buckingham, Mansfield, Ohio.
  Mustered out: September 1, 1865 at Camp Chase, Ohio.
  

Regiments 7th to 8th

• 7th Regiment, Ohio Infantry (3 months, 1861)
  Mustered in: April 22-25, 1861 at Cleveland, Ohio.
  Mustered out: July 24, 1861 at Camp Dennison, Ohio.
  

• 7th Regiment, Ohio Infantry
  Mustered in: June 16, 1861 at Camp Dennison, Ohio.
  Mustered out: July 6, 1864.
  

• 7th Independent Company, Ohio Sharpshooters
  Mustered in: January 27, 1863 at Camp Cleveland, Ohio.
  Mustered out: July 28, 1865 at Headquarters of General Sherman, Commanding Military Division Mississippi.
  

• 7th Regiment, Ohio Cavalry
  Mustered in: October, 1862 at Ripley, Ohio.
  Mustered out: July 4, 1865 at Nashville, Tennessee.
  

• 7th Independent Battery, Ohio Light Artillery
  Mustered in: January 1, 1862 at Camp Dennison, Ohio.
  Mustered out: August 11, 1865.
  

• 8th Regiment, Ohio Infantry (3 months, 1861)
  Mustered in: April 18-May 4, 1861 at Cleveland, Ohio.
  Mustered out: July 24, 1861 at Camp Dennison, Ohio.
  

• 8th Regiment, Ohio Infantry
  Mustered in: June 22, 1861 at Camp Dennison, Ohio.
  Mustered out: July 13, 1865 at Cleveland, Ohio.
  

• 8th Regiment, Ohio Infantry Militia (1 month, 1862)
  "Compendium of the War of the Rebellion" by Frederick H. Dyer contains no history for this unit.
  

• 8th Independent Company, Ohio Sharpshooters
  Mustered in: March 9, 1863 at Camp Dennison, Ohio.
  Mustered out: July 19, 1865 at Headquarters of Generals Rosecrans and Thomas, Commanding Army and Department of the Cumberland.
  

• 8th Regiment, Ohio Cavalry
  Mustered in: January 4, 1864 at Camp Dennison, Ohio.
  Mustered out: July 30, 1865.
  

• 8th Independent Battery, Ohio Light Artillery
  Mustered in: March 11, 1862 at Camp Dennison, Ohio.
  Mustered out: August 7, 1865.
  

• 8th Independent Battery, Ohio Light Artillery (National Guard) (4 months, 1864-65) (60 days, 1865)
  Organized at Johnson's Island, Ohio, for sixty days' service August 15, 1864 at Johnson's Island, Ohio.
  Mustered out: October 17, 1864. Reorganized for four months' service December 19, 1864.
  Mustered out April 19, 1865 at Johnson's Island, Sandusky Bay, Ohio.