Letters to the queen of France describing the battle of Fontenoy. They were printed in Jean-François de Spon, Mémoires pour servir à l'histoire de l'Europe depuis 1740 jusqu'à la paix générale (https://books.google.co.uk/books?id=4GIfuY_MNwIC&newbks=1&newbks_redir=0&printsec=frontcover&hl=fr&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false), and may have been copied from there or from another source.