Head Quarters Robinsons Sepr 26th 1780
I arrived here yesterday on my return from an interview with the French General and Admiral and have been witness to a scene of treason as shocking as it was unexpected—General Arnold from every circumstance had entered into a plot for sacrificing West Point. He had an interview with Major And the British Adjutant General last Week at Joshua; Smiths where the plan was concerted; by an extraordinary concurrence of incidents, Andre was taken on his return with several papers in Arnolds handwriting that proved the treason. The latter unluckely got notice of it before I did—went immediately down the river got on bord the Vulture which brought up Andre and proceeded to New York.
I found the post in the most critical condition and have been taking measures to give it security which I hope will be to night effectual. With the greatest respect & regard I have the honor to be Your most Obt Servt
P.S. Smith is also in our possession and has confessed facts sufficient to establish his guilt—
NHi: George Clinton Papers.