1. JQA reached Copenhagen on 15 Feb., intending to sail from there to Kiel. But contrary winds and harbor ice forced him to abandon that plan, with the result that he departed Copenhagen on 5 March, traveled overland to Hamburg, and—although his diary indicates the 10th—arrived there on the evening of the 11th. Lagau’s information about JQA’s planned departure from Copenhagen was derived from a letter to the French minister at Hamburg written by Matthieu de Basquiat, Baron de La Houze, the French minister at Copenhagen, whom JQA had seen on 19, 23, and 24 Feb. (JQA, Diary description begins Diary of John Quincy Adams, ed. David Grayson Allen, Robert J. Taylor, and others, Cambridge, 1981–. description ends , 1:171–174; AFC description begins Adams Family Correspondence, ed. L. H. Butterfield, Marc Friedlaender, Richard Alan Ryerson, Margaret A. Hogan, and others, Cambridge, 1963–. description ends , 5:97–98, 104; from Pierre Penet, 17 March, below).

2. Claude Antoine, Chevalier de Viviers, French minister to Hamburg since Oct. 1782, was the Comte de Vergennes’ brother-in-law (Repertorium description begins Ludwig Bittner and others, eds., Repertorium der diplomatischen Vertreter aller Länder seit dem Westfälischen Frieden (1648), Oldenburg, 1936–1965; 3 vols. description ends , 3:119; Murphy, Vergennes description begins Orville T. Murphy, Charles Gravier, Comte de Vergennes: French Diplomacy in the Age of Revolution, 1719–1787, Albany, 1982. description ends , p. 167). For the minister’s letter of 3 March to the Duc de La Vauguyon, which repeated Lagau’s report on JQA’s movements at somewhat greater length, see Dumas’ letter of 11 March, and note 1, below.