 In 1762, Rondeau joined as Corporal in the Batallon de Infanteria of Santa Fe, and later was promoted to Lieutenant, serving in Montevideo.In 1784, was responsible for construction the houses of the inhabitants, in villa de la Concepción.In 1785, Juan Bautista Rondeau was appointed by the Viceroy Juan José de Vértiz y Salcedo, to take over the government of Minas, Uruguay.