This "Manual of Instruction" was issued to officers in the Confederate States Army and Navy, after it was written by Col. William Gilham and published by West and Johnston in Richmond circa 1862.
Much of it is text copied from books published by others. including from Hardee's translation/plagiarize of the french 1845 drill book.
So saying he "wrote it" is not really correct. (just like Scoot, Hardee, Chandler, Casey and so on. all copied large parts of of thier book from someone else...)
But he did edit, compile or maybe create it?
It was published in 1861... He was originally making the book for state militias in the USA...
The preface is dated December 1806. The version you link to is just from 1862.
Do you have any evidence that it was
issued to anyone outside of Virginia?
"Hardee's revised" was, by an act of the CSA congress, the drill book to be used by csa infantry. But since they did not authorize the use of any money for the printing and issuing of the book, the change to using it was gradual.
Starting in the west and moving east. (by 1864 VMI changed to it)
So most CSA officers who had a drillbook purchased it them self.
Only North Carolina issued it to their officers, after their state legislature did fund the printing of it.
It is great that you know who used this, because often it is not know what drill book a regiments used at different points of the war.