[Arnold-André Treason]. Ten Eyck, Captain, Jonathan D. P.

Autograph letter signed ("J.D.P. Ten Eyck"), 1 1/4 pages (13 x 8 in.; 330 x 203mm), Ver Plank's Point [New York], 29 September 1780, to Henry Glen; docketed on verso, remnants of seal to left margin, strengthened at folds, marginal separations and tiny chips, browned. 

"Andre & Smith are this day to be Tryed ..."  Tan Eyck forwards information of Arnold's treasonous plot:  "I do not doubt but before this time you have heard of the plot which has been discovered of ... Benedict Arnold ... Arnold delivered [British General Henry Clinton's aid] the plans of the different Fortifications in this department [New York].  Smith & Andre that Evening ... set out for New York [City] ... where [Smith] remained till he was taken.  Major Andre was taken on Saturday morning by three Militia men.  When he offered a large sum of money if they would let him pass which they nobly refused, searched him & brought him to head Quarters.  When Mr Arnold heard of Andre's being taken he immediately under pretence of a flag went on board the  ... Slope of War then in the River.  Andre & Smith are this day to be Tryed, whenever the sentence of the Court is known I shall again write you ..."

Benedict Arnold, upset at his being overlooked for promotion by Congress and alienated from other Continental officers due to his own arrogance, contrived to turn West Point, New York, over to the British for £10,000.  On 21 September 1780 however, British Major John André was captured, carrying incriminating documents.   Arnold fled to the British lines, while André was executed.  Arnold spent the rest of the war in a British uniform fighting his own countrymen, and he relocated permanently to London in 1781, where he remained for the rest of his life.