There is no one by the name Blackwell in the rosters of the 53rd Virginia, Fold 3 or the American CW Research Database.

Leander C. Blackburn

Residence was not listed;
Enlisted on 7/8/1861 at West Point, VA as a Private.

On 7/8/1861 he mustered into "E" Co. VA 53rd Infantry
He died wounds POW on 7/15/1863 at Gettysburg, PA
(Estimated day of death)

He was listed as:
* Hospitalized 4/30/1862 (place not stated) (Sick)
* Hospitalized 8/16/1862 Richmond, VA
* AWOL 2/19/1863 (place not stated)
* Returned 3/9/1863 (place not stated)
* POW 7/3/1863 Gettysburg, PA
* Wounded 7/3/1863 Gettysburg, PA (Wounded in neck & right shoulder)

Promotions:
* Color Sergt 6/3/1862

Sources used by Historical Data Systems, Inc.:
- The Virginia Regimental Histories Series