Much of the Confederate archives were lost during the evacuation and burning of Richmond in April, 1865.
An example is the recovery of company bi-monthly muster rolls. Copies were forwarded to Richmond regularly.
My ggrandfather's 43rd Tennessee Infantry muster records do not exist after March, 1864, though they existed as a unit until
May 1865 and held bi-monthly musters for pay purposes. And then only 7 of the 10 companies reporting March 64'. This is
representative of other regimental records.
In the case of Knoxville hospitals, no records exist at all. For the Chattanooga Foard Hospital, only a register of patients, Nov. 2, 1861
to March 15, 1863 exist in a repository. For the Overton General Hospital, Memphis, only a register of deaths for the period March 3-31, 1862
exist.
Unfortunately, enormous holes exist in available records.