Declan Cronin—Pitcher and Historian

You need to read through the comments section to the end for the answer.
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Henry Heth, prominently featured in the article, was the valedictorian of Georgetown's class of 1837.  Lewis Armistead was in the same class.

John Dooley, captured in Pickett's charge, returned to Georgetown after the war and became a Jesuit.

The last comment was by the co-author, in rebuttal..
Bolding mine.  

Which rumor? The shoes? I heard that one probably 50+ years ago from my father who was an expert on Civil War history. I grew up assuming that was a given. 

Guess now that I am retired I should find the time to read his 3 volume "Lee's Lieutenants" and the 4 volume Carl Sandburg's "Abraham Lincoln" that sit in my office at home. 

Have you seen Ted Turner's "Gettysburg?" An epic. The score is outstanding and Chamberlain's (my personal hero) charge is perhaps the Civil War equivalent of the D-Day scene from "Saving Private Ryan" as it gives a taste of the exhaustion of both sides in that heroic battle within the battle.

Not surprising
a grad of Regis HS in NYC

This was always my understanding. An Ohio State University Department of History website entitled "The Myths of Gettysburg" (https://ehistory.osu.edu/articles/myths-gettysburg) calls the story of shoes at Gettysburg a myth.

The Shoe Factory® of Gettysburg



Myth: The Battle of Gettysburg was fought over a shipment of shoes housed at the Gettysburg Shoe Factory.



Fact: Not only was there not a shoe factory in Gettysburg in 1863, but the Army of Northern Virginia and the Army of the Potomac did not engage in three days of battle to gain control of a mythical shipment of shoes—even though both sides were in need of them, especially the Confederates. Fannie Buehler, wife of Gettysburg postmaster described Confederate General John Gordon's infantry as it marched into town. They were "dirty, …hatless, shoeless, and footsore." Additionally, when Confederate General Jubal Early marched his troops into the town for the first time on June 26 (on his way to Hanover Junction and York), he ordered the town to hand over 1,000 pairs of shoes and 500 hats, or as an alternative $10,000 cash. Gettysburg authorities knew they couldn't fill Early's bill and instead offered to open their stores to him. Early's inspection of the town's shops yielded him little in way of supplies (especially shoes) except for a hefty supply of horseshoes and nails. Source: Coddington, Edwin The Gettysburg Campaign: A Study in Command, 1968 Charles Scribner Sons.

Checking some on-line sites confirms my recollection that the Confederates and Union army were both running generally south to north with the rebels to the west of the Union army. Harrisburg is basically about 40+/- miles northeast of Gettysburg and some Confederate forces reached there and came back south to join the Gettysburg battle "already in progress."

A couple of links:

Troop movements before and during the battle:

www.encyclopediavirginia.org/slide_player?mets_filename=sld541mets.xml

And, an interactive battle map:

www.smithsonianmag.com/history/A-Cutting-Edge-Second-Look-at-the-Battle-of-Gettysburg-1-180947921/