Kevin Dulany Grigsby, author of "From Loudoun to Glory: The Role of African Americans from Loudoun County in the Civil War" at Rock Hill Cemetery in Middleburg. (Matt McClain/FOR THE WASHINGTON POST)

An undertold part of our Civil War history is the role of black soldiers from this area who fought and died for the Union. Local historian Kevin D. Grigsby has written a book titled “From Loudoun to Glory” about African American soldiers from Loudoun County, and The Post’s Michael Ruane has a terrific story about the book and its background.

As you might expect, the Rock Hill Cemetery in Middleburg plays a central role. Vernon Peterson, the admirable caretaker there for 57 years, became curious about a seemingly war-related headstone, and dug into its history. He then told the story to Grigsby, who researched the life stories of those who returned to Loudoun after the war. Ruane’s full story is here.

A more famous/infamous part of Northern Virginia’s Civil War history is being reenacted in Fairfax City this Saturday on its 150th anniversary: Col. John Mosby’s raid on a Union outpost where he captured a general, 32 other soldiers and 58 horses without firing a shot. The reenactment will be outside the Truro Episcopal Church grounds on Main Street, and then various other events and new Civil War exhibits at the city museum and Blenheim House will run from 10 to 6:30 p.m. Here’s the program.

Vernon W. Peterson at Rock Hill Cemetery in February 2013. He has been caretaker there for 57 years. His interest in an untended old grave led to the unearthing of the story of African American soldiers who fought for the Union in the Civil War. (Matt McClain/FOR THE WASHINGTON POST)