Battle of Vuelta de Obligado
The naval Battle of Vuelta de Obligado took place on the waters of the Paraná River on 20 November 1845, between the Argentine Confederation, under the leadership of Juan Manuel de Rosas, and a combined Anglo-French fleet. The action was part of the larger Anglo-French blockade of the Río de la Plata. Although the attacking forces broke through the Argentine naval defenses and overran the land defenses, the battle proved that foreign ships could not safely navigate Argentine internal waters against its government's wishes. The battle also changed the political attitude toward  the Confederation in South America, increasing support for Rosas and his government. Background. During the 1830s and 1840s, the British and French governments were at odds with Juan Manuel de Rosas' leadership of the Argentine Confederation. Rosas' economic policies of requiring trade to pass through the Buenos Aires custom house – which was his method of imposing his will on the Littoral provinces – combined with his attempts to incorporate Paraguay and Uruguay to the Confederation, were in conflict with French and British economic interests in the region. During his government, Rosas had to face numerous problems with these foreign powers, which  in some cases reached levels of open confrontation. These incidents included two naval blockades, the French blockade in 1838, and the Anglo-French of 1845. With the development of steam-powered sailing (which mainly took place in Great Britain, France and the United States) in the third decade of the 19th century, large (and thus ocean-going) merchant and military ships became capable of sailing up rivers at a good speed and with a heavy load. This new technology allowed the British and French governments to avoid the custom house in Buenos Aires by sailing directly through the La Plata  estuary and engaging in commerce directly with inland cities in Entre Ríos, Corrientes, Uruguay and Paraguay. This avoided Buenos Aires' taxation, guaranteed special rights for the Europeans and allowed them to export their products cheaply. Rosas' government tried to stop this practice by declaring the Argentine rivers closed to foreign shipping, barring access to Paraguay and other ports in the process. The British and French governments did not acknowledge this declaration and decided to defy Rosas by sailing upstream with a joint fleet, setting the stage for the battle. Battle. Order of battle. The Anglo-French squadron that was sailing  through the Paraná river in the first days of November was composed of eleven warships. These ships were among the most advanced military machinery of their time, and at least three — "Fulton", and — were steamers, which initially stayed behind the sailing vessels. They were partially armoured, and had rapid-fire guns and Congreve rockets. The main Argentine redoubt was located on a cliff rising between 30 and 180 m over the banks at Vuelta de Obligado, where the river is 700 metres wide and a turn makes navigation difficult. The Argentine general Lucio N. Mansilla, commander of the Confederation forces  and Rosas' brother-in-law, set up three thick metal chains suspended from 24 boats completely across the river, to prevent the advance of the allied fleet. This operation was under the charge of an Italian immigrant named Filipo Aliberti. Only three of these boats were naval vessels; the rest were requisitioned barges whose owners received a compensation in case of loss. Aliberti was the master of one of the boats, the "Jacoba", sunk in the battle. At least 20 boats and barges were lost in the chain barrage at Obligado. On the right shore of the river the Argentines  mounted four batteries with 30 cannons, many of them bronze 8, 10, 12 and 20-pounders. These were served by a division of 160 gaucho soldiers. There were also 2,000 men in trenches under the command of Colonel Ramón Rodríguez , together with the brigantine "Republicano" and two small gunboats, "Restaurador" and "Lagos", with the mission of guarding the chains across the river. Some sources increase the Argentine naval power to a third gunboat, the unarmed brigantine "Vigilante," whose artillery had been dismounted and transferred to one of the batteries, eight armed launches and at least five armed barges. Main action . The combat began at dawn, with intense cannon fire and rocket discharges over the Argentine batteries, which had less accurate and slower loading cannons. From the beginning the Argentines suffered many casualties — 150 dead, 90 wounded. Furthermore, the barges that held the chains were burnt down, and the "Republicano" was lost, blown up by its own commander when he was unable to defend it any longer. A number of armed launches were also sunk in battle. The gunboats "Restaurador" and "Lagos" disengaged successfully and withdrew up river, towards Tonelero pass. The third gunboat and the armed barges also survived the  action, but the dismantled brigantine "Vigilante" was scuttled by her crew and the remaining launches were destroyed by the combined fleet on 28 November. Shortly after, the French steamer "Fulton" sailed through a gap open in the chain's barrier. Disembarked troops overcame the last defenders of the bluff, and 21 cannons fell into the hands of the allied forces. The Europeans had won free passage at the cost of 28 dead and 95 wounded. However, their ships suffered severe damage, stranding them at Obligado for 40 days to make emergency repairs. Secondary action. Meanwhile, 40 km to the north , a small Argentine naval force composed of the sloop "Chacabuco", the gunboats "Carmen", "Arroyo Grande", "Apremio" and "Buena Vista" kept watch over a secondary branch of the Paraná whose control gives full access to the ports of Entre Ríos. Like at Obligado, a double chain held by seven barges was also deployed across the river. When news of the battle's outcome reached the squadron, the "Chacabuco" was scuttled and the remainder of the flotilla took shelter in the port of Victoria. Upstream. Only 50 out of 92 merchantmen awaiting at Ibicuy Islands continued their upriver trip. The rest gave  up and returned to Montevideo. The British and French ships that were able to sail past up river were again attacked on their way back at Paso del Tonelero and at Angostura del Quebracho. The combined fleet suffered the loss of six merchant ships during the later engagement, on 4 June 1846. Aftermath. The Anglo-French victory did not achieve their goal. The severe damage to their naval forces and loss of merchantmen indicated that it would be too costly to sail Argentine rivers without the authorisation of Argentine authorities. Some Unitarian leaders, traditional enemies of the Argentine leader were  moved by the events, with unitarian General Martiniano Chilavert offering to join the Confederacy army. France and the United Kingdom eventually lifted the blockade and dropped their attempts to bypass Buenos Aires' policies. They acknowledged the Argentine government's legal right over the Paraná and other internal rivers, and its authority to determine who had access to it, in exchange for the withdrawal of Rosas's army from Uruguay. The Battle of Obligado is remembered in Argentina on 20 November, which was declared a "Day of National Sovereignty" in 1974, and became a national holiday in 2010. The Paris Métro  had a station named "Obligado" for this battle until 1947, when it was renamed "Argentine", as a good-will gesture after the visit of Eva Perón to France.