Major John André was a British officer whose intelligence work brought him into contact with Benedict Arnold in 1780. Arnold, then commanding the strategically vital American post at West Point, secretly agreed to turn the fortress over to Britain. The scheme promised the British control of the Hudson River corridor and threatened to divide New England from the other states. André carried papers and information needed to complete the betrayal after meeting Arnold near the Hudson.

The plan unraveled when André traveled south through American-controlled territory in civilian clothing. On September 23, militia members John Paulding, David Williams, and Isaac Van Wart stopped and searched him near Tarrytown. They discovered concealed documents relating to West Point. André was taken into custody, and warnings reached George Washington before Arnold could be arrested. Arnold escaped to British lines and served the crown; André remained the prisoner through whom the conspiracy was publicly exposed.

A board of Continental officers convened at Tappan to examine the case. It concluded that André had entered American lines under an assumed name, changed his uniform for civilian dress, and carried intelligence, placing him within the accepted definition of a spy. Washington approved the sentence. Efforts to exchange André for Arnold failed, and on October 2, 1780, André was hanged at a gallows near this location. Contemporary observers often remarked on his composure, even while accepting the judgment.

André was buried near the execution site. In 1821, his remains were removed to Westminster Abbey in Britain, adding another layer to the place’s memorial history. Later monuments and commemorations sometimes generated controversy because admiration for André’s character could seem to diminish the American militiamen who captured him or the danger Arnold’s plot posed. The episode has continued to provoke questions about duty, honor, espionage, and sympathy for an enemy officer.

The marker locates the hanging area rather than the exact surviving gallows, which disappeared long ago. The site represents the final stage of the Revolution’s most famous treason case: secret negotiation, capture, military inquiry, execution, and national memory. It also illustrates the harsh legal distinction between a uniformed enemy and a spy operating in disguise. André’s personal courage at death did not erase his mission, while Arnold’s escape ensured that the subordinate messenger received the punishment the principal traitor avoided.

The three captors refused André’s offers and delivered him to American authorities, a choice Congress later rewarded. Their part in the story underscores how counterintelligence could depend on local patrols and individual decisions. A strategic conspiracy failed not through an elaborate spy network, but at an improvised roadside stop.