The beaten President retired from Entre Rios with the remnants of his army, while Oribe likewise crossed the Uruguay River, and marched leisurely southwards from Salto towards Montevideo. In due time his armies arrived before the capital, which they forthwith proceeded to invest, thus commencing the great siege of the place that endured for nine years.
The circumstances of the beleaguering are too numerous and complicated to bear recapitulation here. One of the most notable features of the earlier days was a proclamation issued by Oribe to the effect that he would spare no foreigners whose sympathies lay with the "rebels," as he termed the Government of Rivera—or rather of Joaquín Suárez, who had taken the defeated President's post in Montevideo. The result of the proclamation was exactly the reverse of that anticipated by Oribe, since the foreigners responded by raising legions of their own and by flocking to the active defence of the town. The capital, however, was closely invested by sea as well as by land, Garibaldi's flotilla finding itself unable to make any headway against Admiral Brown's blockading fleet.
In the meanwhile Rivera had not been idle. With the amazing recuperative power that was characteristic of so many of the noted leaders of the period he had scraped together from the countryside a force of nearly four thousand men. With these he harassed the rear of the besieging force to such effect that the Buenos Aires Government, in order to leave the blockade undisturbed, raised a fresh army, and sent it, under the command of General Urquiza, to cope with the unexpected source of danger.
Urquiza came up with Rivera at India Muerta, and the result was fatal to the Uruguayan force. The end of a desperate conflict saw nearly a thousand of Rivera's men lying dead upon the Campo. In accordance with the drastically conclusive methods of the age, the number of prisoners was small by comparison. As to the surviving remnant, it was scattered to the four winds on the face of the downlands.
The terrible defeat of India Muerta deprived Rivera of his military prestige and Uruguay of her last hope of aggressive warfare. Cooped up in Montevideo, the Government appealed in despair for foreign intervention. England and France, viewing the policy of Rosas with dislike, complied with the request. But in the end their interference proved futile, although the combined European forces went the length of blockading the Argentine ports, and of defeating Rosas's troops on the banks of the Paraná.
Rivera in the meanwhile had fallen upon evil days. His last defeat had involved him in straits that went beyond even the loss of men and power. The fatal day won for him, unjustly enough as it proved, the active suspicion of his own people. Doubtful of his loyalty, the Montevideo Government applied to Brazil for his banishment to Rio de Janeiro. The petition was acceded to; but the Uruguayan leader seemed a veritable human phoenix in his ability to spring undismayed from the ashes of each successive disaster. With the ultimate object of taking an active part once again in his country's defence, he succeeded in getting himself appointed by Montevideo as Minister Plenipotentiary to Paraguay.
Rivera, however, had no intention of proceeding to take up his office. Once free of Brazil, he sailed boldly down the river to Montevideo, and raised the popular opinion of the capital so much in his favour that, after a short period of disturbance in the beleaguered city, he was once again endowed with trust and command. He took himself forthwith to the Campo, where he resumed his warlike operations with varied success.
Nevertheless, it was many years ere this particular period of Uruguay's strenuous vicissitudes came to an end. The year 1851 marked one of the numerous dawns in the fortunes of the land. Then an alliance was concluded between Uruguay and Brazil, while the famous General Urquiza, revolting against the Buenos Aires tyrant, brought the forces of Entre Rios to join the league that was now formed against Rosas. The result was the Battle of Monte Caseros, in which the combined forces made an end to the dictator's power, and caused him to flee to Europe.
The soil of Uruguay was once again free from hostile troops. During the fleeting period of peace that followed, it is necessary to take leave of two of the three Orientales who had ridden to such purpose on the breath of the whirlwind. A little more than two years after the Battle of Monte Caseras, Lavalleja died at Montevideo. In harness to the end, the liberator of his country ended his career just as he had once again been elected to take a share in its government. Three short months later Rivera followed his old comrade and enemy to the land where the cavalry lance is unknown and where no gunshot crashes echo.