HistoricSiteMarkers
Early RepublicCivil War

Caledonia Furnace

Greene Township, Franklin County, Pennsylvania

Marker Inscription

Erected in 1837 by Thaddeus Stevens and James D. Paxton. Stevens' antislavery stand led to its destruction by Gen. Jubal Early, June 26, 1863, on his way to York during the early Gettysburg campaign.

Erected by Pennsylvania Historical and Museum Commission

The Story

Thaddeus Stevens and James D. Paxton built the Caledonia iron furnace here in 1837, part of the charcoal-iron industry that fed early American growth. Stevens went on to become one of Congress's most uncompromising foes of slavery, and in June 1863 — as Robert E. Lee's army moved toward Gettysburg — Confederate Gen. Jubal Early singled out the works and destroyed them, in part as payback for the ironmaster's antislavery politics. Early burned the furnace on June 26 on his march toward York.

Why it matters

It ties Pennsylvania's early iron industry to the moral politics of the Civil War, showing how one man's antislavery convictions made even his furnace a target.

The story behind this marker

AI context

The era

In the decades after the Revolution, iron was the muscle of a growing nation, and much of it came from rural furnaces like this one. In the 1830s, ironmasters built charcoal-fired furnaces deep in the timbered hills, where wood could be burned into fuel and local ore fed a fire that ran day and night.

South-central Pennsylvania was ideal for the trade. The ridges supplied endless charcoal, the valleys held ore and limestone, and streams turned the machinery. A furnace was not just a factory but a small world — colliers, miners, teamsters, and founders all clustered around the glowing stack.

This was the early industrial republic taking shape: not yet the age of great steel mills, but the charcoal-iron era that armed and equipped a young country and laid the groundwork for the industrial power it would become.

People & events

The works here were established in 1837 by Thaddeus Stevens together with James D. Paxton. Stevens is the name that gives this place its lasting fame. He would go on to become one of the most forceful antislavery voices in Congress, a man who pressed the cause of emancipation and equal rights with an uncompromising ferocity that made him admired and hated in equal measure.

That political reputation reached back to touch his iron furnace. In late June 1863, as Confederate forces moved north through Pennsylvania in the campaign that would climax at Gettysburg, Gen. Jubal Early's command came through this area on the march toward York.

Early singled out the furnace for destruction. On June 26, 1863, the works were destroyed — an act understood at the time as retaliation aimed squarely at the antislavery ironmaster who owned them. It was one thing to seize supplies along a line of march; it was another to burn a specific man's livelihood because of what he stood for, and that is what made the loss of this furnace more than an ordinary casualty of war.

Its place in the American story

Few places bind together the two great forces of nineteenth-century America — its industry and its reckoning with slavery — as tightly as this one. The same hills that fed a furnace also produced a congressman whose convictions helped push the nation toward emancipation, and the war made his furnace pay for his politics.

That is the deeper meaning here. The Civil War was not only fought over abstract principles in distant capitals; it reached into the ledger books and workshops of the men who shaped those principles. When an army destroys a specific man's property because of his beliefs, it shows how completely the moral quarrel over slavery had come to define the conflict.

Stevens himself belongs to the national story as one of the architects of the postwar effort to secure rights for the freed. The ruined furnace stands as an early, physical marker of the price he was willing to have his cause exact — and the price his enemies were willing to make him pay.

If you visit

This is a place to slow down and read the land. Old iron furnaces leave their mark on a landscape — the fall of water that powered them, the flat ground where workers lived and worked, the hush of woods that once rang with the sound of the trade. Look for how the site sits in relation to stream and hillside, and you'll understand why an ironmaster chose it.

Come with the double story in mind. This is at once a monument to early American industry and a Civil War site, and holding both ideas at once is what makes standing here worthwhile. You're looking at the spot where a furnace's fate got tangled up in one of the great moral arguments in the country's history.

Set in the wooded ridges of Franklin County, it makes a rewarding stop on a drive through the region's mountain country, where the shade and the streams still feel a world away from the halls of Congress where its founder made his name.

Written by AI to add context, grounded in the marker’s inscription and the historical record. The inscription above is the original, unaltered text.

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Related people

  • · Thaddeus Stevens
  • · Jubal Early
  • · James D. Paxton

Related events

  • · Gettysburg Campaign

Themes & tags

Industry & InventionCivil WarMill / Factory

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