英仏協商
Britain did not have great interests at stake in Buenos Aires. The purpose of the war was to foster the Entente cordiale with France, so as to make possible later joint military operations elsewhere, such as the Opium War or the protection of the independence of the Republic of Texas. The British interests in South America grew when Texas was finally annexed by the United States. Texas supplied Britain with cotton, and the British calculated that it would be easier to secure cotton sources in South America (such as Paraguay) rather than waging war with the powerful United States. Britain republished many Uruguayan libels against Rosas, such as the Blood tables, so that people supported military action against him. As there was a strong British religious tradition, Rosas was accused of replacing the crosses of churches with his portrait, persecuting religion, and killing priests; and that he may have murdered his wife Encarnación Ezcurra and had incestuous relations with his daughter.