Answer
José Gervasio Artigas and Estanislao López were poised to invade Buenos Aires, causing Belgrano to move his army. Belgrano was a general in the United Provinces of the Río de la Plata, and he was responsible for leading the Argentine Army against the Spanish. However, in 1815, Artigas and López, who were caudillos of Uruguay and Santa Fe, respectively, threatened to invade Buenos Aires.