State/County Park | Historic House

Dey Mansion

The Dey Mansion, built around 1770, served as General George Washington’s headquarters in 1780 during a pivotal time in the American Revolution. As one of his surviving field headquarters, it offers a lasting connection to the strategic decisions, military challenges, and historic events that shaped the fight for independence.

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The Dey Mansion, constructed around 1770 by Theunis and Hester Dey, is a prime example of Georgian architecture and played a pivotal role during the American Revolution as General George Washington's headquarters in 1780. The Dey family, with colonial roots dating back to 1641, was prominent in public affairs; Theunis served in the State Council and was a trustee of Queen’s College (now Rutgers University). Washington first arrived at the mansion in July 1780, overseeing military operations such as the attack on Bull’s Ferry, before departing to coordinate with French allies. He returned in October amid the upheaval following Benedict Arnold’s treason, utilizing the mansion's strategic location in the Preakness Valley to safeguard his forces. ​

Washington's office within the Dey Mansion

Washington's Office within the dining room of the Dey Mansion.

During Washington’s stay, military efforts included a planned attack on Staten Island and reconnaissance near Fort Lee, though some operations were ultimately called off. On November 27, 1780, he departed for Morristown, leaving behind a legacy that remains preserved within the mansion’s walls. As one of Washington’s surviving field headquarters, the Dey Mansion offers visitors a glimpse into the challenges and triumphs of the Revolutionary War.

Stories from Dey Mansion

Trail Site

Located along the banks of the Hudson, outnumbered Patriot forces quickly evacuated this site on November 20, 1776, as the British army advanced on their position.

Biography

George Washington’s leadership guided the American colonies through revolution and into nationhood. As a general and the first president, he played a crucial role in shaping the United States’ early foundations.

Biography

Anthony Wayne, dubbed "Mad Anthony," was a bold Revolutionary War general, key in victories like Stony Point and Fallen Timbers. His fiery reputation earned him his nickname. He died in 1796 in Presque Isle, Pennsylvania.