The 12th Indiana Battery Light Artillery was organized in Indianapolis and Jeffersonville, Indiana. It mustered into Union service January 25th 1862 for a term of three years. They left the same for Louisville, Kentucky. The men took part in the siege of Corinth, Mississippi during May of 1862. The 12th joined the Army of the Ohio in June 1862 before being moved the Defenses of Nashville in September of that year. The 12th would also be on duty at the battles of Chattanooga, and the Battle of Nashville in 1864.
The men of the 12th mustered out of service July 7th 1865. The Battery lost 24 men killed in action, and another 24 who from disease.