In the south-east of the Continent the struggle for liberty was far less prolonged than that in the districts of the centre, west, and north. It may be that the wide, open, agricultural plains had infused into the dwellers of Argentina an inherent sense of independence which had continued to flourish and grow, notwithstanding the dominion of the Spaniards. In any case, it was here that the revolt was, if not more enthusiastic, at all events more rapid.
Since 1776, moreover, the date when the provinces of the River Plate were exalted to the condition of a Viceroyalty, a certain freedom of intercourse had obtained which had been utterly lacking before. The trade of the country had expanded, and imports from Europe were now permitted access to the River Plate without first being subjected to the supervision of Panamá or Peru. When the struggle began, it found the Argentine patriots enthusiastic and prepared.
On August 21, 1808, an act of fealty was sworn to Ferdinand VII. This, nevertheless, met with disapproval on the part of many Argentines, who desired the establishment of a junta similar to that of Seville. The party in favour of this increased rapidly in strength, and shortly afterwards the Viceroy, Liniers, resigned. Although he had to a certain extent the support of the patriot party, his position in the face of the complicated situation had become extremely difficult. He was succeeded on July 30, 1809, by Baltasar Hidalgo de Cisneros. The latter lost no time in giving proof of liberal intentions. He opened the ports to English vessels, and the commercial situation of the country, which had been deplorable, improved immediately.
In the meanwhile some revolutionary outbreaks at Chuquisaca and La Paz were suppressed by the Royalist troops with a brutality and wanton slaughtering which roused a storm of indignation in Buenos Aires. Cornelio de Saavedra, one of the patriot leaders in the capital, succeeded, however, in preventing an open rising, since this would undoubtedly have been premature.
A secret society was now formed in Buenos Aires, counting in its ranks Belgrano, Nicolas Rodriguez Peña, Manuel Alberdi, Viamonte, Guido, and others. From this nucleus the regiment of patricios was formed, and was commanded by Cornelio de Saavedra. The chief object of this society was the foundation of an adequate representative Government. To this end its members worked towards the abolition of the Viceroyalty and the formation of a new species of Constitution. On May 22, 1810, a great meeting was held at which it was resolved that the authority of the Viceroyalty had expired. On this it was proposed that a junta should be created. Confusion, dispute, and intrigue followed; but the mind of the people was made up, and its will was no longer to be denied.
The Viceroy, de Cisneros, reluctant to oppose the now strongly expressed popular will, on May 25, 1810, resigned his office in the presence of an immense multitude. From this day the independence of Argentina is officially counted, for on the spot a junta was established. Its members were Saavedra, Belgrano, Alberdi, Castelli, Azcuenaga, Matheu, Larrea, Paso, and Moreno.
While all this was occurring in Buenos Aires, strong Royalist sympathies continued to prevail in the provinces. Montevideo, too, showed itself hostile to the new Government. From this base the Royalists were able to strike at the new republican head-quarters at Buenos Aires, and on February 18 a Spanish fleet sailed to the spot and blockaded the capital. The patriots now made their first important move. A force of 1,200 volunteers, commanded by Ocampo and Balcarce, marched against Córdoba, where Liniers and Concha were in command of the Royalist forces. These latter were defeated and their leaders executed. Flushed by its success, the Argentine army then invaded Peru. A little later followed the victory of Suipacha, after which all the country in the neighbourhood declared itself openly for the revolutionists.
Belgrano, in the meanwhile, led an army into Paraguay. He had confidently expected the adherence of the inhabitants of that country. These, however, remained loyal to the Crown, and Belgrano, defeated, was obliged to retire.
Operations were now begun against the Spanish troops in Uruguay. These were conducted by Belgrano, and in a very short time practically the entirety of the province was in the hands of the revolutionists. Montevideo alone, held by its strong Spanish garrison, continued to resist. The town was closely invested on its landward side. Very soon after this, unfavourable news from Peru caused the Argentines to abandon their aggressive attitude; an armistice was declared so far as Montevideo was concerned, and the South American forces retired from Uruguay.
The news from the north, indeed, was sufficiently serious. After the victory of Suipacha a truce had been agreed upon by Castelli, who was in command of the patriot forces. This he had observed loyally, but Gueneche, the leader of the Spanish troops, had proved himself less scrupulous. Without warning, he had attacked the Argentine army at Huaqui, and had obtained a decisive and sanguinary victory, at the end of which the 800 Argentines who survived had been obliged to retire in some confusion to Potosi.