English military historian who became a French citizen. May have been a spy working for either France or England, or possibly both.

Repeatedly sought financial aid from Franklin. Sent to Franklin his Traité des prairies artificielles (Paris, 1778), in thanks for the money Franklin gave him.

Hoped to dedicate to Franklin his translation of Dupont de Nemours’ Tableau des principes de l’économie politique.

Author of various military works including a Treatise on the use of Defensive Arms… (London, 1771) and a History of the late War in America… (London, 1772).

Apparently entered into a verbal agreement with the comte de Boisgelin to raise sheep on his estate in Brittany (July 1777). A business dispute with the comte led to his imprisonment (c. March 1778).

Alternate form of the name: de Mante.