I think maybe it's another "Perry." If he was talking about W F Perry of the 44th AL surely he would have used a military title - "Col Perry" which was Wm F Perry's rank at Gettysburg, or else "General Perry" since he eventually made Brigadier?
Some of the known dates help narrow it down:
1. Samuel R Johnston died 24 Dec 1899, so the letters had to be written prior to that date.
2. There is an incomplete date on the letter to Rev Peterkin but there's a note (by the date) that says the letter was not written prior to 1878 when Peterkin became a Bishop.
So the letter was written
after Peterkin became a Bishop and
before Sam Johnston died -- between 1878 to 1899. General W F Perry
was alive when these letters were being exchanged; he died in 1901. But I still think Gen. Perry would have been used at least - even if Johnston didn't know his name or initials.
I'm leaning towards an article written by
Leslie J. Perry. He was a former editor of the
Paola Republican (Paola, KS.) In 1889, this Perry was appointed as a civilian serving on the board of publication for the
Official Records of the War of the Rebellion. At various times he had ex-Confederate Generals appointed as assistants (Cadmus M Wilcox, Charles W Field, Lunsford L Lomax, and South Carolinian, John B Erwin.) In September 1892, Perry wrote his first article for the
Evening Star (Washington, DC.)
I'm guessing it was the article referenced here, resulting from interviews with General Longstreet upon his return visit to Antietam in June 1893. The article created quite a stir and commentary about it appeared in a number of newspapers. Here's a
link to the whole article by Leslie J Perry, as reprinted November 11, 1911, but the article below should fill you in on most of the content.
View attachment 386092
View attachment 386093