Dr. J. B. Gaston, Surgeon for the 14th Alabama Infantry Regiment, signed a requisition for forage dated June 30, 1863 (300 pounds of corn). Dr. J. B. Gaston is reported present at Fayetteville, Pennsylvania (near Gettysburg) on a Regimental muster roll for June 1863. I have found no reference that specifically states he was present at Gettysburg, but based upon the muster roll, it is likely he was present with the Regiment at Gettysburg.
Please provide the reference that identifies Dr. Gaston's full name, as I do not have that reference. If you have any additional information on Dr. Gaston, please send it to firstname.lastname@example.org.