Blair's Valley Conservation Group Mercersburg, PA

The History of Blair's Valley

From Tuscarora hunting grounds to Underground Railroad corridor to Civil War crossroads — Blair's Valley has witnessed more of America's story than its quiet hills might suggest.

Before 1730

The Land Before Settlement

Long before European settlers arrived in the Conococheague Valley, the ridges and hollows of what is now Franklin County, Pennsylvania were home to the Massawomeck and Lenape peoples — part of the broader Iroquois world that shaped this landscape for centuries. The Tuscarora Mountains, which form the western wall of Blair's Valley, take their name from the Tuscarora Nation, an Iroquoian-speaking people who migrated north from the Carolinas around 1713 after devastating warfare, eventually settling in New York as the sixth nation of the Haudenosaunee Confederacy.

The valley itself served as a natural corridor — a passage between the Great Appalachian Valley to the east and the mountains to the west. Its flat bottomland along Blairs Valley Road, sheltered by ridges on both sides, made it an ideal hunting ground and seasonal camp. These same geographic qualities would later make it attractive to the Scots-Irish and German settlers who arrived in the 1730s and 1740s.

"The land now called Blair's Valley was once occupied by the Delaware, but ownership was claimed by the Iroquois — a vast hunting ground and corridor of commerce."

Blair's Valley road looking north toward the ridge

Looking north along Blair's Valley Road toward the Tuscarora ridge — the same route traveled by Native peoples, settlers, escaped slaves, and Confederate cavalry.

Blair's Valley in the 1940s
Blair's Valley looking south, c. 1940s — the valley floor has changed little since the first settlers arrived two centuries earlier.
1730s – 1800s

Scots-Irish Settlers & the First Families

The broader Mercersburg area was first settled by James Black, a Scottish-Irish immigrant, around 1730 — the town was originally called "Black's Town" before being renamed Mercersburg after General Hugh Mercer, a hero of both the French and Indian War and the American Revolution. Blair's Valley, running south from Mercersburg toward the Maryland line, was among the first rural stretches settled as farms spread outward from the town center.

The valley took its name from the Blair family, Scots-Irish immigrants who established farmsteads among the ridges. By the late 1700s, several interconnected farming families — including the Lawsons, whose farmstead and cemetery survive to this day — had put down roots in the valley. They cleared the bottomland, built log homes and barns, and established small community institutions.

Among those institutions was a log church. Built in 1844 on the valley floor, it served as a gathering place for worship, community life, and burial. The church still stands today — one of the oldest surviving structures in the valley and the focus of Blair's Valley Conservation Group's preservation work.

The Lawson Farmstead, Blair's Valley — historic photograph

The Lawson Farmstead, one of the valley's original family homesteads. The Lawson family cemetery nearby is one of the conservation group's active preservation projects.

1730

First Settlement

James Black, a Scottish-Irish immigrant, establishes a settlement that would become Mercersburg — then called "Black's Town."

1780

Mercersburg Platted

The town is formally platted and renamed Mercersburg in honor of General Hugh Mercer, Revolutionary War hero.

1844

Log Church Built

Valley families erect the Blair's Valley Log Church — a simple one-room structure of hand-hewn logs that still stands today.

Est. 1844

The 1844 Log Church

Sometime in the mid-1800s, the farming families of Blair's Valley came together to build a house of worship. Using hand-hewn logs and the timber of the surrounding hills, they raised a simple one-room church on the valley floor. It was an act of community as much as faith — a declaration that this scattered collection of farmsteads was a place with permanence and purpose.

For decades the church served as the spiritual and social center of valley life. Families were married here, children were baptized, and the dead were buried in the small cemetery nearby. The congregation gathered through seasons of harvest and hardship, through the upheaval of the Civil War, and through the long quiet that followed as the valley's population slowly thinned over the generations.

By the twentieth century the church had fallen silent. But the building endured — its massive log walls weathered but intact, its stone foundation holding. In November 2024, Blair's Valley Conservation Group acquired the church, committing to its preservation and eventual community use. The congregation that built it is gone, but the church they left behind still has a story to tell.

"They built it of logs and faith. Nearly two centuries later, it still stands."

The Log Church congregation, early 20th century

An early congregation gathered in front of the Blair's Valley Log Church. The original log-and-chink construction is clearly visible behind them.

The Log Church, c. 1960s

The church as it appeared in the 1960s — already showing its age, but still standing as it does today.

1830s – 1865

The Underground Railroad

Blair's Valley played a quiet but significant role in one of America's most dramatic stories. Lying just north of the Mason-Dixon line, the Mercersburg area was a critical threshold for enslaved people fleeing north to freedom. And Blair's Valley Road was one of the routes they walked.

According to the Mercersburg Historical Society, escaping enslaved people traveled through Blair's Valley on a path leading into Pennsylvania, guided at night by which side of the trees the moss grew on. Some settled in a community southwest of Mercersburg that became known as "Little Africa." Others continued north through Cove Gap and beyond.

Local farmers — including Acheson Ritchey, who farmed outside Mercersburg — sheltered those who came through, feeding them and deciding whether to keep them hidden or move them on to the next station. The passage through Blair's Valley was dangerous. The Fugitive Slave Act of 1850 had made slave-catchers a constant threat in the region, and the proximity to the Maryland border made capture a real risk at every turn.

When Confederate forces occupied Mercersburg during the Civil War, they conducted systematic searches for formerly enslaved people in the area, capturing some who had been born free. The valley's role as a corridor of freedom is one of its most significant and least-told stories.

"In our area many of the escaping slaves walked on a path through Blairs Valley that led into Pennsylvania, guided by which side of the trees the moss lay."

— Mercersburg Historical Society
C.M. Rohrer Grocery, Blair's Valley — a historic community gathering point

The C.M. Rohrer store in Blair's Valley — a community landmark in the valley's small settlement, where locals gathered for generations.

Blair's Valley landscape
October 10, 1862

Stuart's Raid — The Confederacy Comes to Blair's Valley

On the morning of October 10, 1862 — just three weeks after the bloodiest single day of the Civil War at Antietam — Confederate Major General J.E.B. Stuart led 1,800 cavalry and four artillery pieces across the Potomac River and into Pennsylvania. Their route took them directly through Blair's Valley and into Mercersburg.

Stuart's mission, ordered by General Robert E. Lee, was to disrupt Union supply lines, seize horses and provisions, and embarrass the Federal army still camped in Maryland. Riding north from the Potomac crossing at McCoy's Ford, Stuart's column followed the valley road — the same route walked by the area's settlers and by escaped slaves — arriving in Mercersburg around noon on October 10th.

The Confederates occupied the town for approximately two hours. They commandeered the town square, looted nearly every merchant in Mercersburg, and seized hundreds of pairs of boots and shoes — enough to re-equip Stuart's advance division. One local merchant, J.N. Brewer, lost between 400 and 600 pairs of shoes, compensated only with Confederate scrip worth nothing in Pennsylvania.

Nine Mercersburg residents were taken as hostages to be exchanged for captured Confederate officials. By 2:30 p.m. the column was moving east toward Chambersburg. One local minister captured the town's stunned reaction: "They behaved very decently. They were gentlemen's robbers."

The raid was a humiliation for the Union. Harper's Weekly called it "one of the most surprising feats of the war." President Lincoln, furious that Stuart had ridden completely around the Union army, replaced General McClellan as commander of the Army of the Potomac just weeks later. Blair's Valley had been a front-row witness to one of the Civil War's most audacious moments.

October 10, 1862 — Stuart's Route Through the Valley

  • Stuart crosses the Potomac at McCoy's Ford at dawn with 1,800 cavalrymen and 4 cannons
  • The column enters Pennsylvania south of Mercersburg, riding north along Blair's Valley Road
  • By noon, Confederate forces occupy Mercersburg's town square
  • Stores are looted — hundreds of boots, shoes, food, and dry goods seized; merchants paid in worthless Confederate scrip
  • 9 Mercersburg civilians taken prisoner as hostages; some held for months at Libby Prison in Richmond
  • By 2:30 p.m., Stuart's column moves east toward Chambersburg, leaving the shaken town behind
  • Stuart returns to Virginia, having ridden completely around the Union Army of the Potomac — 120 miles in under 60 hours
  • President Lincoln replaces General McClellan on November 7, 1862, partly due to his failure to stop the raid

By the Numbers

  • 1,800 Confederate cavalrymen in Stuart's raiding force
  • 4 12-pound artillery pieces carried on the raid
  • ~2 hours Stuart occupied Mercersburg
  • 9 Mercersburg civilians taken hostage
  • 400–600 pairs of boots seized from one merchant alone
  • 1,200 horses carried off across Pennsylvania
  • 120 miles covered in under 60 hours — a complete circuit of the Union Army
Harper's Weekly — The Rebel Raid into Pennsylvania, Stuart's Cavalry, 1862

Harper's Weekly — "The Rebel Raid into Pennsylvania — Stuart's Cavalry on their Way to the Potomac." Sketched near Poolesville, Maryland by A.R. Waud, 1862.

Stuart's Raid historical marker, Pennsylvania

The Pennsylvania historical marker at Stuart's entry point into the state, October 10, 1862.

Then & Now

The Valley Today

The farms that once lined Blair's Valley Road have largely fallen quiet. The families that built them — the Blairs, the Lawsons, and their neighbors — have scattered or passed into history. The small community that gathered at the log church for worship and fellowship is long gone. What remains are the structures they left behind: the church, the farmstead ruins, the old stone cemetery.

Blair's Valley Conservation Group was founded in 2024 to ensure those remnants survive. The organization acquired the Log Church in November 2024 and has begun the work of stabilizing and restoring it. The Lawson Cemetery — where some of the valley's earliest families rest — is another active preservation project.

The valley itself remains largely as it always was: a quiet corridor between ridges, a place where history accumulated quietly over centuries without anyone making much note of it. That is exactly why it needs protecting.

Stone foundation remains of a homesite in Blair's Valley

Stone foundation ruins of an old homesite in Blair's Valley — one of many remnants of the families who farmed this land for generations.

Help Preserve This History

The Log Church has stood since 1844.
Help it stand another century.

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