The siege of Montevideo occurred during the Brazilian War of Independence, during which the Brazilian Army under Carlos Frederico Lecor attempted to capture the city of Montevideo in Cisplatina (now Uruguay) from the Portuguese Army of Álvaro da Costa de Sousa de Macedo. The siege lasted from 20 January 1823 until 8 March 1824 when the Portuguese surrendered to the Brazilian forces. The naval defeat in the Battle of Montevideo (1823) also contributed to hasten the surrender of the Portuguese troops. The event marked the end of the resistance against independence of Brazil in its territory.
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Text from the Wikipedia article “Siege of Montevideo”, available under CC BY-SA 4.0.