Francis Lynde, Mr. Arnold: A romance of the Revolution (1923)
“ I had a part answer to this puzzling question of the reason for Castner’s delay when, while I was as yet hanging upon my heel and not knowing which way to turn, I saw an officer with the shoulder-straps of a general descending Sir Henry Clinton’s steps; a man walking slowly and with his head bowed and his hands tightly locked behind him. The man was Benedict Arnold; and they had just been giving him the undeniable proof of my treachery. I knew it as well as if I had been an eavesdropper at the conference behind Sir Henry Clinton’s closed door. ”
