Great Notch is a natural passage through the First Watchung Mountain in northern New Jersey. During the Revolution, such gaps were strategically important because ridges limited the movement of artillery, wagons, and large bodies of troops. British forces based in New York and around the coastal plain could use the passes to threaten the more protected interior. Continental officers therefore watched routes through the Watchungs as part of a defensive system extending toward Morristown and the Hudson Highlands.

In October 1780, George Washington was headquartered at the Dey Mansion in what is now Wayne. The marker records that he used the Great Notch area as a lookout while quartered there. From elevated ground, observers could study roads and approaches associated with British-held New York. This was a period of intense concern following Benedict Arnold’s treason and the capture of Major John André, so reliable intelligence, guards, and communication mattered even when no large battle was in progress.

Major James Parr’s rifle corps camped in a ravine near the notch from October 9 to 17. Riflemen were useful as scouts and light troops because they could operate in broken terrain and observe an enemy beyond the main army’s lines. Their presence helped protect the pass and supported Washington’s broader screen of detachments. Camp life would have involved pickets, patrols, cooking, maintenance, and movement of messages as much as dramatic combat.

The location illustrates a quieter but essential dimension of Revolutionary warfare. Armies survived by controlling corridors, detecting hostile movement, and preventing surprise. New Jersey’s topography gave Washington layers of protection between the British base at New York and the Continental interior, but only if gaps such as Great Notch were watched. Roads and ravines that appear local on a modern map could influence the security of headquarters, magazines, and entire encampments.

No major engagement is known to have occurred at the marker itself in October 1780. Its significance comes from surveillance and temporary occupation. Later development has changed the visible landscape, yet the relationship among the notch, nearby ridges, and routes still explains the choice of position. The marker connects Washington’s Dey Mansion headquarters with the dispersed network of riflemen and observers who guarded northern New Jersey during a tense phase of the war.

Great Notch also helps explain why minor camps deserve documentation. A short occupation by a rifle corps may leave fewer written or physical traces than a winter encampment, but it completed the observation network on which larger headquarters depended. Strategic security was produced through many such temporary positions.