In 1777 it served as George Washington's headquarters during the Revolutionary War, and it was the site of Benedict Arnold's first trial in 1780.

[4] The National Park Service claims "Much of [Morris]town's social, political, and business life was conducted at Arnold's Tavern" during the Revolutionary era.

That year, Morristown historian Julia Keese Colles moved the building to her estate on Mt.

Kemble Avenue, it was expanded to become the site of All Souls' Hospital, operated by lawyer Paul Revere, great-grandson of the Revolutionary War figure.

"[3] The Tavern was located beside "the Morris County courthouse and jail [and] the Presbyterian and Baptist churches.

During the Revolutionary War, from January to May 1777, the Tavern was George Washington's headquarters[4][19][20][21] while he received munition from Hibernia mines.

[24][25] By that year, Arnold's Tavern had "sprouted an extension with a large public hall for dances."

Washington convened councils in the hall, and allegedly designated himself an office and a bedroom on the Tavern's second floor.

[3] Morristown historian Julia Keese Colles states that the ballroom was "where [Washington] received his generals, Greene, Knox, Schuyler, Gates, Lee, de Kalb, Steuben, Wayne, [William] Winds, Putnam, Sullivan and others, besides distinguished visitors from abroad, all of whom met here continually during the winter of 1777.

[28] In an unknown year, Colles renovated the Tavern into the "Colonial House," which was "a residence for summer boarders who came to Morristown as a vacation area.

[8] In 1896, the Adams & Fairchild Grocers moved into the Hoffman Building, built atop the Tavern's original site.

[9] According to Caroline Foster and Barbara Hoskins, "The ballroom was transformed into the chapel while the dining room was the hospital ward.

Here is still the bedroom which Washington occupied, the parlor, the dining-room and the ball-room where he received his generals, Greene, Knox, Schuyler, Gates, Lee, de Kalb, Steuben, Wayne, [William] Winds, Putnam, Sullivan and others, besides distinguished visitors from abroad, all of whom met here continually during the winter of 1777.