If I recall, most if not all, of the battlefield historic sites in Virginia started out as Virginia State memorials, only later to be transfered to the U. S. Government's Park Service.
So it is not surprising that a (pardon my Southernism) Yankee battlefield (did they win that battle?) site would not be commemorated.
I've visited sites in Gettysburg too, on US parkland, where major Confederate charges occured--with no commemorative signs or markers anywere to be found. A lack of recognition of Confederate efforts in Pennsylvania...go figure. There are endless memorials to various Union units there though. Thee too, the mememorials were originally private/local/or State, only later did the Park Service take over.
My grandparents purchased a 175 acer farm near Greenville, VA, in 1955. A wonderful plot of land. My grandfather was 75 years old at the time. He was a real "get go" sort of guy.
When I was there, when 13 years old, we took a "home tour" and visited a wonderful "pre-war" home.
There was an achient old lady who explained the family protrait in the dining room, who said the "slash" in the old family portrait was made by a "Damn Yankee".
It is part of my personal family and national history.
It was classic and understandable.
Being a California boy, I did not have a clue.
The Gettysburg rules were set by the winners.
Regimental monuments were only allowed where a unit spent the night, therefore all the union regimental monuments are on the high ground and all the confederate regimental monuments are at the bottom of hills. There is 1 Maryland confederate marker up by spangler's spring because they held it overnight and were driven back in the AM.
In addition in the 50 years after the battle, when most of the monuments were done, the local teams had both more money to pay for the work and more people who could make the trip to see it. Pennsylvania has the largest monument, etc.
Yous guys do have a few nice monuments along Confederate Avenue, including the Alabama monument. It's so fiercesome it looks like you won.
Even with all these advantages for the home team, everybody I ever met there sides with the South, especially since the Scout Medal hike ends with Pickett's charge. The youth campsite that our Scout troop used is actually in the woods where Pickett's division spent the night before the charge.