The First Cevallos expedition is a military action between September 1762 and April 1763, by Spanish colonial forces led by Don Pedro Antonio de Cevallos, Governor of Buenos Aires, against Portuguese colonial forces in the Banda Oriental area during the Seven Years' War.
The Portuguese territories of Colonia do Sacramento and Rio Grande do Sul are conquered by the Spaniards.
The Anglo-Portuguese forces are defeated and forced to surrender and retreat.
The Colonia do Sacramento and the near territories are under Spanish control until the Treaty of Paris (1763), while Rio Grande do Sul will be reconquered by Portugal a few years later.
The Cevallos expedition is one of only two significant Spanish successes during its short involvement (1762-63) in the Seven Years' War, a war where the Spanish suffer a number of major defeats.
The other is the resistance to British rule in the Philippines.
