The decade-long Ragamuffin War starts when rebels capture Porto Alegre in Brazil.

The Ragamuffin War, also known as the Ragamuffin Revolution or Heroic Decade, was a republican uprising that began in southern Brazil, in the province of Rio Grande do Sul in 1835. The rebels were led by Generals Bento Gonçalves da Silva and Antônio de Sousa Neto with the support of the Italian fighter Giuseppe Garibaldi. The war ended with an agreement between the two sides, known as the Treaty of Ponche Verde, in 1845.

Porto Alegre is the capital and largest city of the Brazilian state of Rio Grande do Sul. Its population of roughly 1.4 million inhabitants (2022) makes it the 11th-most populous city in the country and the centre of Brazil's fifth-largest metropolitan area, with 4.1 million inhabitants (2022). The city is the southernmost capital city of a Brazilian state.