Anglo-French blockade of the Río de la Plata

Anglo-French blockade of the Río de la Plata
	Part of the Uruguayan Civil War
	; A painting of the Battle of Vuelta de Obligado by François Pierre Barry
Date	1845–1850
Location	Río de la Plata Basin
Result	Argentine victory; Arana–Southern Treaty; Arana–Lepredour Treaty;
Belligerents
Argentina; Supported by:; White Party	United Kingdom ; France ; Supported by:; Colorados ; Redshirts
Commanders and leaders
Juan Manuel de Rosas ; Lucio Norberto Mansilla ; William Brown ; Manuel Oribe	William Gore Ouseley; Samuel Inglefield; Antoine-Louis Deffaudis; François Thomas Tréhouart; Fructuoso Rivera; Giuseppe Garibaldi
Casualties and losses
250	100 and much of its fleet

The Anglo-French blockade of the Río de la Plata, also known as Paraná War, was a five-year naval blockade imposed by France and the United Kingdom on the Argentine Confederation during the Uruguayan Civil War. It was imposed by the Royal Navy and French Navy in 1845 against the Río de la Plata Basin to support the Colorado Party in Uruguay's civil war, resulting in the closure of Buenos Aires to maritime commerce. The Argentine government, led by Juan Manuel de Rosas, refused to drop their support for the Uruguyan White Party, which supported Argentina's resistance to the blockade. Eventually, both Britain and France ended the blockade, signing the Arana-Southern Treaty in 1849 and 1850 respectively, which acknowledged Argentine sovereignty over its rivers.