Thomas Clarke House

Brigadier General Hugh Mercer spent 9 days dying upstairs at the Thomas Clarke House after Princeton in 1777. Visitors report hands at their necks.

Brigadier General Hugh Mercer was beaten to the ground with musket butts and stabbed seven times with bayonets after his horse was shot out from under him at the Battle of Princeton on January 3, 1777. The British thought he was George Washington. He was a 50-year-old Scottish physician and Washington's closest friend. They left him for dead in an orchard. Continental soldiers carried him to the Thomas Clarke House, a modest white clapboard Quaker farmhouse pressed into service as a field hospital. Mercer spent nine days dying in an upstairs bedroom. The room still gets reports of hands tightening around visitors' necks.

The Clarke House was built in 1772 as the center of a 200-acre Quaker farm. On the day of the battle, Washington's Continental Army fought across this family's fields in the victory that revived the Colonial cause after the Christmas crossing of the Delaware. Mercer led his men into an orchard and ran into a larger British force. When the British demanded his surrender, he drew his saber and charged. The bayonet wounds did the real damage.

Dr. Benjamin Rush, a signer of the Declaration of Independence, tended to him alongside Major George Lewis, Washington's own nephew. Mercer already knew. He pointed to a specific bayonet wound beneath his arm and told Lewis it would be the one that killed him. Rush's letters from those nine days include a strange discrepancy. On January 6th he wrote mourning Mercer as already dead. The next day he wrote again, reporting that the general was recovering. Whether that reflects the chaos of wartime mail or something stranger is something historians still argue about. Mercer finally died on January 12, 1777, in George Lewis's arms, his cravat removed as he lay suffering. His body was shipped to Philadelphia's City Tavern for public display as a martyr for American independence.

The haunting at the Thomas Clarke House centers on that upstairs bedroom. Multiple custodians and at least one visitor have reported a sensation around their necks, as if something unseen were tightening there. Researchers connect it to the removal of Mercer's cravat during treatment, though that's a theory, not a verdict. People entering the house commonly describe peculiar sensations and a heavy melancholy, as if they've walked into a space where sustained suffering left an imprint in the room.

The house sits on Princeton Battlefield State Park. About 50 soldiers from both armies are buried in unmarked graves under the surrounding grounds. Paranormal investigators running EMF meters, thermometers, and dowsing rods have documented multiple ghost hunts on the property. During a 2023 investigation, participants reported communicating with what they believed was a British soldier's spirit, one who said he was at peace with his family but "was not" a fan of his king. Temperature readings near the burial site pillars dropped on command when investigators asked spirits to respond.

The Thomas Clarke House is still furnished in Revolutionary War period style, with much of the original flooring, moldings, and windows intact from the era when Mercer was dying upstairs. It's open Wednesday through Sunday. Proceeds from some of the ghost hunts go directly back into restoring the building where he died.

The Mercer story isn't a persistence tale. He didn't linger because he refused to go. He lingered because he told them, nine days in, exactly which wound was killing him, and they couldn't stop it. The Thomas Clarke House is the room where a doctor diagnosed his own death and was proven right.