The thirty-three had now abandoned their cautious north-west fringing of the coast. With their numbers increasing as they went, they struck for the south-east, making boldly for Montevideo itself, and defeating the various Portuguese forces that strove to oppose them.

Arrived at length at San José, some three score miles distant from Montevideo, Lavalleja determined on an especially daring move that proved his appreciation of the value of prestige. From there he sent all his prisoners with a strong guard under Rivera to Durazno, and at Canelones, farther on, he detached another party to obtain recruits from the neighbourhood of Maldonado. He himself, accompanied now by no more than a hundred men, continued in supreme unconcern his march to Montevideo. Arriving upon the outskirts of the spot, he encamped on the Cerrito de la Victoria, whence, employing a colossal piece of bluff, he set himself to besiege the city.

It is surely not often that a hundred men have sat down to invest a fortified town garrisoned by nearly two thousand soldiers. Yet it was in the amazing effrontery of the proceeding that success lay. On the very next day a strong force of the enemy, numbering over fifteen hundred men with four guns, sallied out from Montevideo. The hundred besiegers must doubtless have thought that all was lost; but, continuing the grim farce to the end, they opened fire to the best of their ability upon the advancing columns. The result more than fulfilled their most sanguine expectations. Convinced that the furious fusillade emanated from a powerful army, the Portuguese columns retired into the town, while the hundred men sat down again to continue the siege of Montevideo.

But their number did not now long remain at this ridiculously inadequate total. By twos and tens and even by hundreds the Orientales escaped from the city, flocking to the tricolour banner until the patriot army had swollen to a degree that rendered it formidable in fact as well as in fancy. So successful, moreover, had proved Rivera's mission in the Campo that in a few days almost the whole of Uruguay was in arms against the enemy's forces in its midst.

The work of the thirty-three had been extraordinarily rapid. So successful, indeed, had been the campaign that, in the place of disputing against another's authority, the moment had arrived for setting up their own, against which it should be treason to contend.

In order to effect this Lavalleja withdrew personally from the siege of Montevideo, and established an independent government at the town of Florida to the north of the capital. Moved by a truly lofty sense of patriotism, he handed over his leadership to the new authorities, who responded by creating him General-in-Chief of the Army of Liberation, and by endowing Rivera with the rank of Inspector-General. On this occasion the titles conveyed some material significance, since the Uruguayan Army now amounted to two thousand five hundred men.

The opening of this new Senate was attended by a dramatic incident. In order to be present at the assembly it was necessary for Lavalleja to leave the front of hostilities and to ride through rain and mud to Florida.

Ere entering the Hall of Assembly he was met by several ladies, amongst whom was the wife of Rivera, who begged him to change his dripping costume before he proceeded with the official business. "Thank you, señoras," replied Lavalleja, "I will attend to that as soon as our country has its government." Within a few minutes the consummation had been achieved, and Lavalleja was in dry clothes. The story affords only one more instance of the numerous inevitable satellites that attend the passage of a notable name through the ages; but here the ingenuous simplicity of the tale is almost sufficient in itself to vouch for its truth. At this point, properly speaking, ends the story of the thirty-three. Beneath the national edifice that they had built up the minor members of the devoted band had already become lost to view. The control of affairs was now vested in a Senate and Corporations, and Argentina, hastening to recognise the existence of the independent Government, sent her armies to its assistance, stipulating that in exchange for the alliance Uruguay should become one of the provinces of the River Plate.

With the survival of the first perils, moreover, the cohesion of the leaders of the famous thirty-three passed away. During the course of the final battles against the Portuguese a rivalry sprang into existence between Lavalleja and Rivera that gradually deepened into a jealous antagonism that has left its mark of bitterness upon the country to this day.

With the growing certainty of the success of the cause, and, consequently, of the honours and power in store for the chosen few among the patriot ranks dissension and suspicion became rampant. One of the more immediate outcomes of this regrettable state was the falling under suspicion of Rivera. Accused of opening up negotiations with the Portuguese, he was sent to Buenos Aires for trial. Acquitted by President Rivadavia of traitorous intent, he was, nevertheless, held in prison owing to his outspoken federal views, which were in direct opposition to the unitarian doctrines of Argentina. After a while, however, he escaped from captivity, and, collecting an army, completely re-established his reputation by invading and conquering the Misiones districts that were then in the power of the Portuguese. Although the territory was in the end ceded back again, the invasion was of material effect in concluding the war.