- ^ Fournier, p. 210. A Spanish army reinforced by a French auxiliary corps was despatched across the Portuguese frontier, and on the 6th of June, 1801, John VI. was forced to sign the treaty of Badajoz, which closed all Portuguese harbors to the English, and by a special convention, September 29th, he was bound to pay France twenty million francs.
- ^ Brodrick and Fotheringham, p. 6. A French army was despatched to Portugal and enabled Bonaparte to dictate the treaty of Madrid, signed on September 29, whereby Portugal ceded half Guiana to France and undertook, as at Badajoz, to close her ports against England.
- August Fournier (translated by Margaret W. Bacon Corwin and Arthur Dart Bissell). Napoleon the First: A Biography. H. Holt and Company, 1903.
- George Charles Brodrick and John Knight Fotheringham. The History of England, from Addington's Administration to the Close of William IV.'s Reign 1801–1837 (Volume XI). Longmans, Green, 1906.