[3] A portion of the first encampment site, known as the Washington Camp Ground, was added to the National Register of Historic Places on July 3, 1975.

Its position provided a natural fortress not only protecting the Continental Army but also overlooking the plains towards New Brunswick, where the British forces were stationed in 1777.

A surviving earthen redoubt believed to date to the 1777 encampment is also located on the mountain within Washington Valley Park.

This event is commemorated annually since 1889 on July 4 with a changing of the flag, a reading of the Declaration of Independence, and the delivery of an historical address at the Washington Camp Ground.

Also, by special order of Congress, a Thirteen Star Flag is flown 24 hours a day at the Washington Camp Ground.

The main cantonment stretched across a broad swatch of Somerset County including sites in present-day South Bound Brook, the Finderne section of Bridgewater, Somerville, and.

[8] The cantonment ended on June 3, 1779 when Washington led his army north to Highlands, New York and General John Sullivan began the 1779 summer campaign against the Iroquois Nation.

A sign commemorating the encampment also stands in a now-developed area, at the corner of Chimney Rock and Gilbride Roads in Bridgewater.

All five colonial homes that served as headquarters to the Generals during the cantonment were preserved at various times by local organizations beginning in 1898 with the Wallace House and all are now National Register Sites open to the public.