The 12TH OHIO VOLUNTEER CAVALRY, 1863-65, was organized at Camp Cleveland (see CIVIL WAR CAMPS IN CLEVELAND) and mustered into federal service on 24 Nov. 1863. From Dec. 1863-Feb. 1864, the 12th was on duty at Camp Chase in Columbus, OH. Half of the regiment was on detached duty at Johnson's Island near Sandusky, OH, during that period. In Feb.-Mar. 1864, the 12th was on duty at Camp Dennison near Cincinnati, OH. Seventy-five Clevelanders served in the regiment. During the remainder of the CIVIL WAR, the 12th was assigned to the following units: 2d Brigade, 5th Div., 23d Army Corps, Dist. of Kentucky (Apr.-July 1864); 4th Brigade, 1st Div., Dist. of Kentucky, Dept. of the Ohio (July 1864-Feb. 1865); and the Cavalry Brigade, Dist. of East Tennessee (July-Nov. 1865). The 12th Cavalry participated in the opposition to John Hunt Morgan's invasion of Kentucky, the Southwest Virginia Expedition, and Stoneman's raids into southwest Virginia. The 12th was mustered out on 14 Nov. 1865 in Nashville, TN, and its members discharged and paid off at Camp Chase shortly thereafter. The regiment lost 50 enlisted men to hostile causes and 112 to disease.