Ohio VolunteerWhen his captain was killed during the Battle of Perryville, John Calvin Hartzell was made commander of Company H, 105th Ohio Volunteer Infantry. He led his men during the Battle of Chickamauga, the siege of Chattanooga, and the Battle of Missionary Ridge. Edited and introduced by Charles Switzer, Ohio Volunteer: The Childhood and Civil War Memoirs of Captain John Calvin Hartzell, OVI documents military strategy, the life of the common soldier, the