Passage: In South America , the Portuguese conquered from Spain most of the Rio Negro valley, and repelled a Spanish attack on Mato Grosso . Between September 1762 and April 1763, Spanish forces led by don Pedro Antonio de Cevallos, Governor of Buenos Aires  undertook a campaign against the Portuguese in Uruguay and South Brazil. The Spaniards conquered the Portuguese territories of Colonia do Sacramento and Rio Grande de São Pedro and forced the Portuguese to surrender and retreat. Under the Treaty of Paris , Spain had to return to Portugal the colony of Sacramento, while the vast and rich territory of the so-called "Continent of S. Peter"  would be retaken from the Spanish army during the undeclared Hispano-Portuguese war of 1763-1777. As consequence of the war the Valdivian Fort System, a Spanish defensive complex in southern Chile, was updated and reinforced from 1764 onwards. Other vulnerable localities of colonial Chile such as Chiloé Archipelago, Concepción, Juan Fernández Islands and Valparaíso were also made ready for an eventual English attack.
For how many years did the undelcared Hispano-Portuguese war occur? How many colonies did Portugal ge back in the Treaty of Paris? How many months did the Spanish campaign against the Portuguese in Uruguay and South Brazil last? How many other localities of colonial Chile were also made ready for English attack? How many total territories were considered vulnerable localities of colonial Chile? How many total years did the Hispano-Portuguese war last for? How many years did it take the Portuguese from Spain the Rio Negro Valley? How many years did the Hispanio-Portuguese war 1763-1777 last? How many years did the Hispano-Portuguese war last? How many years did the campaign against the Portuguese and the Hispano-Portuguese war ? How many years from the start of the Hispano-Portuguese war did the Spanish reinforce the Valdivian Fort System? Over how many months did the Spanish forces led by don Pedro Antonio de Cevallos undertake a campaign against the Portugese in Uruguay and South Brazil? What was the former 1/10 of a decade that Spanish forces led a campaign against the Portuguese in Uruguay and South Brazil? What was the former month that Spanish forces led a campaign against the Portuguese in Uruguay and South Brazil? What was the last year of the "Continent of S. Peter" was to be retaken from the Spanish army? What was the latter 1/10 of a decade that Spanish forces led a campaign against the Portuguese in Uruguay and South Brazil? What was the latter month that Spanish forces led a campaign against the Portuguese in Uruguay and South Brazil? What was the starting year of the "Continent of S. Peter" was to be retaken from the Spanish army? Which event happened first, when the Spaniards conquered the Portuguese territory of Colonia do Sacramento or when the Portuguese conquered the Rio Negro valley? Which events had to happen due to the Treaty of Paris, South Brazil colonies had to be returned to Portugal or Spain had to return to Sacramento?