Arana–Lepredour Treaty

In the late 1840s, Argentina attempted to regulate traffic on the Paraná and Uruguay rivers, which impacted upon Anglo-French trade with the landlocked Paraguay.

Argentina owed a substantial debt to Barings Bank and suspension of payments due to the blockade had caused financial concerns.

The parliament was divided in two proposals: to send Le Prédour with a very powerful navy, to make a treaty favourable to the French terms by intimidating Rosas, or to openly declare war.

Rosas finally agreed on August 31, 1850, to a pair of small concessions that did not actually modify the important points of the treaty: Rosas would remove the Argentine troops from Montevideo at the same time that France removed theirs, but keeping a portion of them during the first months of Oribe's rule to prevent anarchy; and Argentina would refer to Oribe in the document as "President of the Republic" while France would do so as "Brigadier General".

The final treaty was signed by Argentinian Minister of Foreign Affairs Felipe Arana [es] and Admiral Fortuné Le Prédour de Kerambriec [fr] on August 31, 1850.