Letters from Stephen Cassin to William Tudor,

One letter inquiring about Commodore John Orde Creighton, whom Cassin was replacing as commander of the naval squadron off the coast of Brazil. One letter asking Tudor’s advice on what action to take in regard to an altercation between two Americans and a Brazilian naval officer.

Letter from Edward J. Coale to William Tudor,

One letter requesting Tudor forward a package of letters.

Letters from John Orde Creighton to William Tudor,

Five letters on topics including General Juan Lavalle and warring factions in Buenos Aires and news of mutual friends and associates.

Letters from John Orde Creighton to William Tudor,

Six letters on topics such as the Brazilian export duty, the movements of other naval officers, and interactions with various dignitaries

Letter from William Dana,

One letter requesting assistance with a claim against the Brazilian government relating to the condemned schooner Joseph Meade.

Letters from John Murray Forbes to William Tudor,

Five letters regarding the arrival of English Admiral Robert Waller Otway, the movements of Juan Lavalle and his troops, and the "feverish state" of the population of Buenos Aires in light of the recent violence associated with the Decembrist revolution.

Letters from John Murray Forbes to William Tudor,

Six letters regarding ongoing civil wars in the Argentinean provinces, peace negotiations, and Forbes’ implementation of the Monroe Doctrine, as well as diplomatic discussions with the provisional government in Buenos Aires, which sought American intervention. Forbes also includes a copy of a letter he wrote to the provisional government regarding privateering.

Letters from John Murray Forbes to William Tudor,

Five letters regarding the peace negotiations between Argentinean factions. He also writes of news of the intentions of Spain to establish a "paternal government" in Mexico.

Letters from John Murray Forbes to William Tudor,

Four letters in which Forbes discusses the peace achieved in Buenos Aires, and the question of whether to reinstall the junta that was overthrown in the Decembrist revolution, as well as a meeting with the new governor, Juan Manuel Rosas. He also describes the response in Buenos Aires to the peace reached between Colombia and Peru, and the funeral of executed Buenos Aires Governor Manuel Dorrego.

Letters from Michael Hogan to William Tudor,

Four letters discussing news of friends and domestic politics and the presidential election, in addition to trade and purchases of certain goods.

Letters from Michael Hogan to William Tudor,

Four letters regarding unrest in Chile, the election of Vice President Joaquín Vicuña and inception of the Chilean Civil War, and subsequent events related to the war.

Letters from Robert Waller Otway to William Tudor,

Two letters regarding an upcoming visit on ship and shore.

Letters from Claude Charles de Rosamel to William Tudor,

Two letters extending professional courtesy and discussing an incident between French and American vessels. In French.

Letters from Albin Reine Rousseau to William Tudor,

Two letters regarding a meeting and the conveyance of correspondence. In French.

Letters from George W. Slacum to William Tudor,

One letter of professional courtesy and one letter regarding the capture of the American ship Frances.