Letter written on December 4, 1781 from Philadelphia, Pennsylvania by Baron de Watergeul Boom to "Mon Cher Ami" concerning celebration on board French ship after Yorktown Campaign. He writes poetry about the party, particularly talking of bachelorhood. Baron de Watergeul Boom may be a pseudonym. Includes poem with classical allusion which is annotated. Original letter is written in French, but English transcription is included.